The depravity of man…

The most empirically verifiable reality is the depravity of man, and yet it is also the one that is the most hotly debated.

Malcolm Muggeridge

The only part of Christian theology…

The universal moral depravity of human beings is abundantly clear. G. K. Chesterton wryly referred to the doctrine of original sin as “the only part of Christian theology which can really be proved.”

G. K. Chesterton, quoted in The Battle for the Beginning by John MacArthur, p. 196