When Macarius was a young brahmacari in an ashram he used to write to Swami Dhireshan who was a very great monk of order. He wrote that people in this ashram are behaving so badly I can't put up with it anymore. And then the answer came. The answer was one line, a one-liner and it said, remember there are those who put up with you too.
"Do not pray for the fulfillment of your wishes, for they may not accord with the will of God. But pray as you have been taught, saying: Thy will be done in me (cf. Luke 22:42). Always entreat Him in this way - that His will be done. For He desires what is good and profitable for you, whereas you do not always ask for this." - Evagrius Ponticus.
Swami Sarvapriyananda speaks on Evagrius's teachings on prayer.