64. A virtuous way of life and gratitude towards God are fruits of man that are pleasing to God. The fruits of the earth are not brought to perfection immediately, but by time, rain and care; similarly, the fruits of men ripen through ascetic practice, study, time, perseverance, self-control and patience. And if, because of all you do, anyone should ever think that you are a devout man, distrust yourself so long as you are in the body, and think that nothing about you is pleasing to God. For you must know that it is not easy for anyone to keep himself sinless until the end.

—St Anthony the Great
On the Character of Men and on the Virtuous Life
One Hundred and Seventy Texts