I love everything about this quote. It is given by J.I. Packer. It is about C.S. Lewis, and it expresses a point emphasized by Martyn Lloyd-Jones.
[C.S. Lewis] would have agreed with the often-stated dictum of fellow evangelist Martyn Lloyd-Jones that the Christian is and must be the greatest thinker in the universe, and that God’s first step in adult conversion is to make the person think. J.I. Packer, “Still Surprised by Lewis,” CT September 7, 1998, page 56.