He who has mastery over his incensive power has mastery also over the demons. But anyone who is a slave to it is a stranger to the ways of the Saviour, for as the Saviour enjoined us: 'Learn from Me; for I am gentle and humble in heart: and you will find rest for your souls' (Mt. 11:29). Now if a man abstains from food and drink, but becomes incensed to wrath because of evil thoughts, he is like a ship sailing the open sea with a demon for a pilot.