The Spiritual Life, St. Theophan the Recluse

If a person has lived for some time, almost everything is done by habit. Rarely does any new enterprise or undertaking occur which departs from the usual order of business and knowledge. So it is that life which has been established demands acts corresponding to itself. As these acts repeat themselves often, it is natural that they become habits, ways and rules of life and character...

( The Spiritual Life, St. Theophan the Recluse)