Sayings of Abba Nilus:

Everything you do in revenge against a brother who has harmed you will come back to your mind at the time of prayer.

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Do not be always wanting everything to turn out as you think it should, but rather as God pleases; then you will be undisturbed and thankful in your prayer.

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Whatever you have endured out of love of wisdom will bear fruit for you at the time of prayer.

The Sayings of the Desert Fathers, Sr. Benedicta Ward, Kalamazoo, Michigan: Cistercian Publications, 1975), pp. 153-155