St. Symeon the New Theologian.
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Rejoice in the Lord, brother; rejoice in the Lord, beloved; rejoice in the Lord, fellow heir. Unceasing prayer is in accordance with the measure of dispassion. Then, the coming of the Spirit is known, and teaches us everything. If it teaches us everything, then it also teaches us about prayer. For the Apostle says, "We do not know how to pray as we should. But the Spirit itself intercedes for us with ineffable groanings" (Rom. 8:26).
Saints Barsanuphius & John
Letters from the Desert
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"If you are fond of dressing elegantly, or when you put on your clothes, think of the incorruptible garment of righteousness in which our souls should be arrayed, or of Jesus Christ Who is our spiritual raiment, as it is said: 'For as many of you as have been baptized into Christ, have put on Christ' (Gal. 3:27)."
St. John of Kronstadt
My Life in Christ: Part II, Holy Trinity Monastery pg. 286
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"None of your suffering has come by chance. Nothing can happen to us without our Lord's consent; and His consent is not only wise but always dictated by His love of us. Carefully examine your conscience and your life, and I am sure you will understand what I mean. Sorrow weighs you down? Never mind. The grateful heart, humble and wise - the heart which has become grateful, humble, and wise - will be greatly consoled and blessed with serene joy."
St. Macarius of Optina