st maximus the confessor

“Let us be satisfied simply with what sustains our present life, not with what pampers it. Let us pray to God for this, as we have been taught, so that we may keep our souls unenslaved and absolutely free from domination by any of the visible things loved for the sake of the body. Let us show that we eat for the sake of living, and not be guilty of living for the sake of eating. The first is a sign of intelligence, the second proof of its absence.” (St. Maximus the Confessor)

In all of our deeds God looks at the intention, whether we do it for His sake, or for the sake of some other intention.
—  St. Maximus the Confessor
Then when someone else does evil to you, be affectionate and humble toward him, and treat him kindly, and you will deliver him from this passion. 
—  St. Maximus the Confessor

The outcome of every affliction endured for the sake of virtue is joy, of every labor rest, and of every shameful treatment glory; in short, the outcome of all sufferings for the sake of virtue is to be with God, to remain with Him forever and to enjoy eternal rest.

St Maximus the Confessor