Anger

An angry person is a willing epileptic, who due to an involuntary tendency keeps convulsing and falling down. The Ladder of Divine Ascent step 8.11 St. John Climacus

The Lord directed his first words against anger as the most serious sinful wound, the chief passion opposed to the two main virtues - love for one’s neighbor and humility. Upon these two chief virtues is built the whole structure of the Christian life. Remaining in slavery to the passion of anger takes away a person’s ability for any spiritual progress. -St. Ignatius Brianchaninov, The Field, P. 35