~ The Jesus Prayer
One must seek peace and light and strength in God through the Jesus Prayer. When it becomes very hard for you and gloom surrounds you, stand before the icon, light the lampada if it hasn't been lit, kneel if you are able, or else just say "Lord Jesus Christ, son of God, have mercy on me, a sinner." Say it once, again, a third time- say it so that it's not just your lips that are pronouncing it, but in such a way that it reaches your heart. And then, the sweetest Name of the Lord will without fail reach your heart, and little by little the melancholy and grief will subside and your soul will become bright. A quiet joy will reign in it.
Elder Barsanuphius of Optina
life, (p. 458)
~ On Anxiety
Let us not then grieve, beloved, let us not despond on account of the present tribulation, but let us admire the well-devised plan of God?s wisdom. For by these very means through which the devil hoped to overturn our city, hath God restored and corrected it. The devil animated certain lawless men to treat the very statues of the Emperor contemptuously, in order that the very foundations of the city might be razed. But God employed this same circumstance for our greater correction; driving out all sloth by the dread of the expected wrath: and the thing has turned out directly opposite to what the devil wished, by the means which he had himself prepared.St. John Chrysostom
Homilies on the statues to the people of Antioch, Homily XV