Do not neglect the practice of the virtues; if you do, your spiritual knowledge will decrease, and when famine occurs you will go down into Egypt (Genesis 41:57, 46:6).
One cannot approach the knowledge of the truth with a disturbed heart. Therefore we must try to avoid everything that disturbs our heart, that causes forgetfulness, excitement or passion, or that awakens unrest. We must free ourselves as much as possible from all fuss and flutter and ado over vain things. Yes, when we serve the Lord we shall not be troubled about many things, but always keep in mind that one thing is needful (Luke 10:41).
You must flee from sensual things. Verily, every time a man comes close to a struggle with sensuality, he is like a man standing at the edge of a deep lake, and the enemy throws him in whenever he likes. But if the man lives far from sensual things, he is like one who stands at a distance from the lake, so that even if the enemy entices him in order to throw him to the bottom, God sends him help at the very moment that the enemy is drawing him away and doing him violence.
It is not possible for a man to control his anger when abused, or to overcome trials with patience when afflicted, if he is not willing to take the last and lowest place among other men.
Habit forms from custom, and habit seems to accustom itself to nature. It is much worse and more difficult to change nature. However, with God it is possible. For nature does not set itself against God.