“Watch and pray that you may not enter into temptation; the spirit indeed is willing, but the flesh is weak.” (Matt. 26:41, Mark 14:38)
St. John Chrysostom: “Inasmuch as Christ Himself came to instruct us in all virtue, He both tells us what ought to be done, and does it… He commanded men to pray for their enemies (Matt. 5:44, Luke 6:28) and teaches this by means of His acts; for when He had ascended the cross He said, ‘Father forgive them for they know not what they do (Luke 23:34).’ Therefore, as He commanded men to pray so does He Himself pray, instructing you to do so by His own persistent utterances of prayer.
“Since then He commanded them to pray ‘lead us not into temptation [but deliver us from evil] (Matt. 6:13),’ He instructs them in this very precept by putting it into practice Himself, saying ‘Father if it be possible, let this cup pass away from Me (Matt. 26:39).’ Thus teaching all the saints not to plunge into dangers, not to fling themselves into danger… not to rush forwards themselves, or to be the first to advance against terrors. Why pray this way? Both to teach us lowliness of mind, and also to deliver us from the charge of vainglory. On this account it is also said in this passage that… after He had prayed He said to His disciples ‘Could you not watch with me one hour? Watch and pray that you enter not into temptation.’ Jesus not only prays but also admonishes, ‘For the spirit indeed is willing,’ He said, ‘but the flesh is weak (Matt. 26:41, Mark 14:38).’
“Now this He said by way of emptying their soul of vanity and delivering them from pride, teaching them self-restraint, training them to practice moderation. Therefore, the prayer which He wished to teach them, He Himself also offered… instructing us to pray, and even to seek deliverance from distress; but, if this be not permitted, then to acquiesce in what seems good to God. Therefore He said ‘Nevertheless, not as I will but as Thou wilt (Matt. 26:39);’ not because He had one will and the Father another; but again, that He might instruct men…
“By means of this prayer, Christ taught both these truths, that we should not plunge into dangers, but rather pray that we may not fall into them; but if they come upon us we should bear them bravely, and postpone our own will to the will of God. Knowing these things then let us pray that we may never enter into temptation; but if we do enter it let us beseech God to give us patience and courage, and let us honor His will in preference to every will of our own. For then we shall pass through this present life with safety, and shall obtain the blessings to come: which may we all receive by the favor and lovingkindness of our Lord Jesus Christ, with Whom be to the Father, together with the Holy Spirit, glory, might, honor, now and forever world without end. Amen.” (St. John Chrysostom (347-407), Excerpts from Against Marcionists and Manichaeans)