Augustine of Hippo

But why this? Because He "scourgeth every son whom He receiveth." Why this? Because to men sinning was it said, "In the sweat of thy face shall thou eat bread." Therefore because all these chastisements, in which all our bed is turned in our infirmity, man ought to acknowledge that he suffers for sin; let him turn himself, and say what follows: "I said, Lord, be merciful unto me; heal my soul, for I have sinned against Thee." O Lord, by tribulations do Thou exercise me; to be scourged Thou judgest every son whom Thou wilt receive, who sparedst not even the Only-Begotten. He indeed without sin was scourged; but I say, "I have sinned against Thee."...