St. Basil the Great
Do not straightway attempt extreme discipline; above all things beware of confidence in yourself, lest you fall from a height of discipline through want of training. It is better to advance a little at a time. Withdraw then by degrees from the pleasures of life, gradually destroying all your wonted habits, lest you bring on yourself a crowd of temptations by irritating all your passions at once. When you have mastered one passion, then begin to wage war against another, and in this manner you will in good time get the better of all.
http://www.ccel.org/ccel/schaff/npnf208.ix.xliii.html
