In Homily 17, St. Isaac begins to lay out a "Rule of Life" for those seeking to live chastely and in a way pleasing to God. Chiefly this means showing restraint and wisdom in regard to every aspect of life: sight, speech, attire, food, alcohol, etc. Thus, discretion is put forward as the most important of all the virtues - the ability to discern between good and evil. Purity of heart and purity in action is essential; as is setting aside all egoism. Indiscriminate familiarity in relations with others must be avoided and a proper respect for boundaries in relationships and in daily interactions is essential. This is not fastidiousness but rather an acknowledgment of the power of the senses, desires, appetites - indeed all that is human. All must be purified and transformed by the grace of God.
Philokalia Ministries