Let us, therefore, forsake the vanity of the crowd and their false teachings and turn back to the word delivered to us from the beginning, "watching unto prayer" and continuing steadfast in fasting, beseeching fervently the all-seeing God "to lead us not into temptation, even as the Lord said, "The spirit indeed is willing, but the flesh is weak."
—Polycarp (69-156)
Learn more about Polycarp here.