When John Piper entered seminary in 1968, he believed in the self-determining will of man. But then he encountered Philippians 2 Chapter 2 1 If there is therefore any exhortation in Christ, if any consolation of love, if any fellowship of the Spirit, if any tender mercies and compassions, 2 make full my joy, that ye be of the same mind, having the same love, being of one accord, of one mind; 3 `doing' nothing through faction or through vainglory, but in lowliness of mind each counting other better than himself; 4 not looking each of you to his own things, but each of you also to the things of others. 5 Have this mind in you, which was also in Christ Jesus: 6 who, existing in the form of God, counted not the being on an equality with God a thing to be grasped, 7 but emptied himself, taking the form of a servant, being made in the likeness of men; 8 and being found in fashion as a man, he humbled himself, becoming obedient `even' unto death, yea, the death of the cross. 9 Wherefore also God highly exalted him, and gave unto him the name which is above every name; 10 that in the name of Jesus every knee should bow, of `things' in heaven and `things' on earth and `things' under the earth, 11 and that every tongue should confess that Jesus Christ is Lord, to the glory of God the Father. 12 So then, my beloved, even as ye have always obeyed, not as in my presence only, but now much more in my absence, work out your own salvation with fear and trembling; 13 for it is God who worketh in you both to will and to work, for his good pleasure. 14 Do all things without murmurings and questionings: 15 that ye may become blameless and harmless, children of God without blemish in the midst of a crooked and perverse generation, among whom ye are seen as lights in the world, 16 holding forth the word of life; that I may have whereof to glory in the day of Christ, that I did not run in vain neither labor in vain. 17 Yea, and if I am offered upon the sacrifice and service of your faith, I joy, and rejoice with you all: 18 and in the same manner do ye also joy, and rejoice with me. 19 But I hope in the Lord Jesus to send Timothy shortly unto you, that I also may be of good comfort, when I know your state. 20 For I have no man likeminded, who will care truly for your state. 21 For they all seek their own, not the things of Jesus Christ. 22 But ye know the proof of him, that, as a child `serveth' a father, `so' he served with me in furtherance of the gospel. 23 Him therefore I hope to send forthwith, so soon as I shall see how it will go with me: 24 but I trust in the Lord that I myself also shall come shortly. 25 But I counted it necessary to send to you Epaphroditus, my brother and fellow-worker and fellow-soldier, and your messenger and minister to my need; 26 since he longed after you all, and was sore troubled, because ye had heard that he was sick: 27 for indeed he was sick nigh unto death: but God had mercy on him; and not on him only, but on me also, that I might not have sorrow upon sorrow. 28 I have sent him therefore the more diligently, that, when ye see him again, ye may rejoice, and that I may be the less sorrowful. 29 Receive him therefore in the Lord with all joy; and hold such in honor: 30 because for the work of Christ he came nigh unto death, hazarding his life to supply that which was lacking in your service toward me. and Romans 9 Chapter 9 1 I say the truth in Christ, I lie not, my conscience bearing witness with me in the Holy Spirit, 2 that I have great sorrow and unceasing pain in my heart. 3 For I could wish that I myself were anathema from Christ for my brethren's sake, my kinsmen according to the flesh: 4 who are Israelites; whose is the adoption, and the glory, and the covenants, and the giving of the law, and the service `of God', and the promises; 5 whose are the fathers, and of whom is Christ as concerning the flesh, who is over all, God blessed for ever. Amen. 6 But `it is' not as though the word of God hath come to nought. For they are not all Israel, that are of Israel: 7 neither, because they are Abraham's seed, are they all children: but, In Isaac shall thy seed be called. 8 That is, it is not the children of the flesh that are children of God; but the children of the promise are reckoned for a seed. 9 For this is a word of promise, According to this season will I come, and Sarah shall have a son. 10 And not only so; but Rebecca also having conceived by one, `even' by our father Isaac-- 11 for `the children' being not yet born, neither having done anything good or bad, that the purpose of God according to election might stand, not of works, but of him that calleth, 12 it was said unto her, The elder shall serve the younger. 13 Even as it is written, Jacob I loved, but Esau I hated. 14 What shall we say then? Is there unrighteousness with God? God forbid. 15 For he saith to Moses, I will have mercy on whom I have mercy, and I will have compassion on whom I have compassion. 16 So then it is not of him that willeth, nor of him that runneth, but of God that hath mercy. 17 For the scripture saith unto Pharaoh, For this very purpose did I raise thee up, that I might show in thee my power, and that my name might be published abroad in all the earth. 18 So then he hath mercy on whom he will, and whom he will be hardeneth. 19 Thou wilt say then unto me, Why doth he still find fault? For who withstandeth his will? 20 Nay but, O man, who art thou that repliest against God? Shall the thing formed say to him that formed it, Why didst thou make me thus? 21 Or hath not the potter a right over the clay, from the same lump to make one part a vessel unto honor, and another unto dishonor? 22 What if God, willing to show his wrath, and to make his power known, endured with much longsuffering vessels of wrath fitted unto destruction: 23 and that he might make known the riches of his glory upon vessels of mercy, which he afore prepared unto glory, 24 `even' us, whom he also called, not from the Jews only, but also from the Gentiles? 25 As he saith also in Hosea, I will call that my people, which was not my people; And her beloved, that was not beloved. 26 And it shall be, `that' in the place where it was said unto them, Ye are not my people, There shall they be called sons of the living God. 27 And Isaiah crieth concerning Israel, If the number of the children of Israel be as the sand of the sea, it is the remnant that shall be saved: 28 for the Lord will execute `his' word upon the earth, finishing it and cutting it short. 29 And, as Isaiah hath said before, Except the Lord of Sabaoth had left us a seed, We had become as Sodom, and had been made like unto Gomorrah. 30 What shall we say then? That the Gentiles, who followed not after righteousness, attained to righteousness, even the righteousness which is of faith: 31 but Israel, following after a law of righteousness, did not arrive at `that' law. 32 Wherefore? Because `they sought it' not by faith, but as it were by works. They stumbled at the stone of stumbling; 33 even as it is written, Behold, I lay in Zion a stone of stumbling and a rock of offence: And he that believeth on him shall not be put to shame. . Some people may assume John Piper was born a Calvinist. Nope. In fact, his embrace of Reformed soteriology came at the expense of some very painful life experiences, some of which he shared in a 2002 sermon. Here’s Pastor John explaining one of those key moments from his life in seminary when he came face to face with Philippians 2 Chapter 2 1 If there is therefore any exhortation in Christ, if any consolation of love, if any fellowship of the Spirit, if any tender mercies and compassions, 2 make full my joy, that ye be of the same mind, having the same love, being of one accord, of one mind; 3 `doing' nothing through faction or through vainglory, but in lowliness of mind each counting other better than himself; 4 not looking each of you to his own things, but each of you also to the things of others. 5 Have this mind in you, which was also in Christ Jesus: 6 who, existing in the form of God, counted not the being on an equality with God a thing to be grasped, 7 but emptied himself, taking the form of a servant, being made in the likeness of men; 8 and being found in fashion as a man, he humbled himself, becoming obedient `even' unto death, yea, the death of the cross. 9 Wherefore also God highly exalted him, and gave unto him the name which is above every name; 10 that in the name of Jesus every knee should bow, of `things' in heaven and `things' on earth and `things' under the earth, 11 and that every tongue should confess that Jesus Christ is Lord, to the glory of God the Father. 12 So then, my beloved, even as ye have always obeyed, not as in my presence only, but now much more in my absence, work out your own salvation with fear and trembling; 13 for it is God who worketh in you both to will and to work, for his good pleasure. 14 Do all things without murmurings and questionings: 15 that ye may become blameless and harmless, children of God without blemish in the midst of a crooked and perverse generation, among whom ye are seen as lights in the world, 16 holding forth the word of life; that I may have whereof to glory in the day of Christ, that I did not run in vain neither labor in vain. 17 Yea, and if I am offered upon the sacrifice and service of your faith, I joy, and rejoice with you all: 18 and in the same manner do ye also joy, and rejoice with me. 19 But I hope in the Lord Jesus to send Timothy shortly unto you, that I also may be of good comfort, when I know your state. 20 For I have no man likeminded, who will care truly for your state. 21 For they all seek their own, not the things of Jesus Christ. 22 But ye know the proof of him, that, as a child `serveth' a father, `so' he served with me in furtherance of the gospel. 23 Him therefore I hope to send forthwith, so soon as I shall see how it will go with me: 24 but I trust in the Lord that I myself also shall come shortly. 25 But I counted it necessary to send to you Epaphroditus, my brother and fellow-worker and fellow-soldier, and your messenger and minister to my need; 26 since he longed after you all, and was sore troubled, because ye had heard that he was sick: 27 for indeed he was sick nigh unto death: but God had mercy on him; and not on him only, but on me also, that I might not have sorrow upon sorrow. 28 I have sent him therefore the more diligently, that, when ye see him again, ye may rejoice, and that I may be the less sorrowful. 29 Receive him therefore in the Lord with all joy; and hold such in honor: 30 because for the work of Christ he came nigh unto death, hazarding his life to supply that which was lacking in your service toward me. :12–13 and Romans 9 Chapter 9 1 I say the truth in Christ, I lie not, my conscience bearing witness with me in the Holy Spirit, 2 that I have great sorrow and unceasing pain in my heart. 3 For I could wish that I myself were anathema from Christ for my brethren's sake, my kinsmen according to the flesh: 4 who are Israelites; whose is the adoption, and the glory, and the covenants, and the giving of the law, and the service `of God', and the promises; 5 whose are the fathers, and of whom is Christ as concerning the flesh, who is over all, God blessed for ever. Amen. 6 But `it is' not as though the word of God hath come to nought. For they are not all Israel, that are of Israel: 7 neither, because they are Abraham's seed, are they all children: but, In Isaac shall thy seed be called. 8 That is, it is not the children of the flesh that are children of God; but the children of the promise are reckoned for a seed. 9 For this is a word of promise, According to this season will I come, and Sarah shall have a son. 10 And not only so; but Rebecca also having conceived by one, `even' by our father Isaac-- 11 for `the children' being not yet born, neither having done anything good or bad, that the purpose of God according to election might stand, not of works, but of him that calleth, 12 it was said unto her, The elder shall serve the younger. 13 Even as it is written, Jacob I loved, but Esau I hated. 14 What shall we say then? Is there unrighteousness with God? God forbid. 15 For he saith to Moses, I will have mercy on whom I have mercy, and I will have compassion on whom I have compassion. 16 So then it is not of him that willeth, nor of him that runneth, but of God that hath mercy. 17 For the scripture saith unto Pharaoh, For this very purpose did I raise thee up, that I might show in thee my power, and that my name might be published abroad in all the earth. 18 So then he hath mercy on whom he will, and whom he will be hardeneth. 19 Thou wilt say then unto me, Why doth he still find fault? For who withstandeth his will? 20 Nay but, O man, who art thou that repliest against God? Shall the thing formed say to him that formed it, Why didst thou make me thus? 21 Or hath not the potter a right over the clay, from the same lump to make one part a vessel unto honor, and another unto dishonor? 22 What if God, willing to show his wrath, and to make his power known, endured with much longsuffering vessels of wrath fitted unto destruction: 23 and that he might make known the riches of his glory upon vessels of mercy, which he afore prepared unto glory, 24 `even' us, whom he also called, not from the Jews only, but also from the Gentiles? 25 As he saith also in Hosea, I will call that my people, which was not my people; And her beloved, that was not beloved. 26 And it shall be, `that' in the place where it was said unto them, Ye are not my people, There shall they be called sons of the living God. 27 And Isaiah crieth concerning Israel, If the number of the children of Israel be as the sand of the sea, it is the remnant that shall be saved: 28 for the Lord will execute `his' word upon the earth, finishing it and cutting it short. 29 And, as Isaiah hath said before, Except the Lord of Sabaoth had left us a seed, We had become as Sodom, and had been made like unto Gomorrah. 30 What shall we say then? That the Gentiles, who followed not after righteousness, attained to righteousness, even the righteousness which is of faith: 31 but Israel, following after a law of righteousness, did not arrive at `that' law. 32 Wherefore? Because `they sought it' not by faith, but as it were by works. They stumbled at the stone of stumbling; 33 even as it is written, Behold, I lay in Zion a stone of stumbling and a rock of offence: And he that believeth on him shall not be put to shame. . Here he is to explain. Read or listen to this interview at our website: https://www.desiringgod.org/interviews/how-did-john-piper-become-a-calvinist Find other recent and popular Ask Pastor John episodes: https://www.desiringgod.org/ask-pastor-john