The importance of continuance in prayer

35 And he went forward a little, and fell on the ground, and prayed that, if it were possible, the hour might pass from him.
36 And he said, Abba, Father, all things are possible unto thee; take away this cup from me: nevertheless not what I will, but what thou wilt.
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.

If it was necessary for Jesus the divine Son of God to repeat His prayers how much more important is it for us sinful mortals to do the same?