Heart and Logic

"[The Christian religion] teaches men both these truths: that there is a God of whom we are capable, and that a corruption in our nature makes us unworthy of Him. It is equally important for us to know both these points; for it is equally dangerous for man to know God without knowing his own wretchedness, and to know his wretchedness without knowing the Redeemer who can cure him of it. Knowledge of only one of these points leads either to the arrogance of the philosophers, who have known God and not their own wretchedness, or to the despair of the atheists, who know their wretchedness without knowing the Redeemer." -Blaise Pascal

Blaise Pascal (1623-1662) was a French mathematician, physicist and religious philosopher. His religious thought emphasizes "the reasons of the heart" over those of dry logic and intellect.
His most famously quoted line, "The heart has reasons that reason cannot know," is usually used to follow one's heart instead of one's logic, but I'm reassured by the above quote that he did not dismiss logic and that his faith was grounded in the sound reasoning of God's call:

"Come now, and let us reason together, saith the LORD: though your sins be as scarlet, they shall be as white as snow; though they be red like crimson, they shall be as wool" (Isaiah 1:18).