Watch and pray, lest you enter into temptation. The spirit truly is ready, but the flesh is weak.
All Commentaries on Mark 14:38 Go To Mark 14
Augustine of Hippo
AD 430
For, if these things are placed in our power through the capability of nature and the freedom of the will, anyone can see that it would be useless to ask them of the Lord, and even deceitful to pray, if we ask in prayer for what our nature so constituted already possesses by our own strength. Then, the Lord Jesus would not have said: “Watch and pray,” but only “Watch, lest you enter into temptation.” He would not have said to the blessed chief of the apostles: “I have prayed for you,” but simply: “I warn you, or command you, or enjoin you that your faith should not fail.” Letter , To Pope Innocent.