Non-Christians seem to think that the Incarnation implies some particular merit or excellence in humanity. But of course it implies just the reverse: a particular demerit and depravity. No creature that deserved Redemption would need to be redeemed. They that are whole need not the physician. Christ died for men precisely because men are not worth dying for; to make them worth it.
- C.S. Lewis
Original sin may be defined as the hereditary corruption and depravity of our nature. This reaches every part of the soul, makes us abhorrent to God's wrath and produces in us what Scripture calls works of the flesh.
- John Calvin
The treatment of our Lord Jesus Christ by men is the clearest proof of total depravity. Those must be stony hearts indeed which can laugh at a dying Savior and mock even his faith in God!
- Charles Spurgeon
Nothing leads to self-repudiation so much as spiritual meditation on the corruption and wickedness of your heart. If your soul has grasped human depravity you have been forced to deny yourself... No man can conclude in his heart, 'in me dwelleth no good thing' (Romans 7:18) and then continue to live for himself.
- Walter J. Chantry