“I think, therefore I am.” Do you know the story behind René Descartes’ famous statement? In this message, R.C. Sproul addresses the doubt of this French philosopher and helps us uncover the unshakable foundation of our faith. Study Reformed theology with a free resource bundle from Ligonier Ministries: https://grow.ligonier.org/?utm_source=youtube&utm_medium=description&utm_campaign=get-started This message is from Dr. Sproul’s 32-part teaching series Defending Your Faith. Learn more: https://www.ligonier.org/learn/series/defending-your-faith