The memory of insults…

The memory of insults is the residue of anger. It keeps sins alive, hates justice, ruins virtue, poisons the heart, rots the mind, defeats concentration, paralyzes prayer, puts love at a distance, and is a nail driven into the soul. If anyone has appeased his anger, he has already suppressed the memory of insults, while as long as the mother is alive the son persists. In order to appease the anger, love is necessary.
— Saint John Climacus (c. 525-606)

Distractions and desires…

The dark powers are sick with envy against us when we pray, and they will use every conceivable trick to frustrate us spiritually. They endlessly stir up our inner memories to distract us into thoughts and will try to stir our flesh to all kinds of desires, for in this way they think they can hinder the soul’s glorious ascent and its journey to God.
–Evagrius Ponticus (345-399)