Many people think that they are achieving great things in external works such as fasting, going barefoot and other such practices which are called penances. But true penance, and the best kind of penance, is that whereby we can improve ourselves greatly and in the highest measure, and this consists in turning entirely away from all that is not God, or of God in ourselves and in all creatures, and in turning fully and completely towards our beloved God in an unshakeable love so that our devotions and desire for him become great.

(Meister Eckhart)