Mark 14:38 in the World English Bible
Watch and pray, that you may not enter into temptation. The spirit indeed is willing, but the flesh is weak.”
Context
37 And he cometh, and findeth them sleeping, and saith unto Peter, Simon, sleepest thou? couldest not thou watch one hour?
38 Watch ye and pray, lest ye enter into temptation. The spirit truly is ready, but the flesh is weak.
39 And again he went away, and prayed, and spake the same words.