The divine grace that is everywhere-present and fills all things directly inspires the spirit of man, impressing thoughts and feelings upon it that turn it away from all finite things and toward another better, albeit invisible and mysterious world. The general characteristics of such arousals are dissatisfaction with oneself and everything pertaining to oneself, and anguish over something. The person is not satisfied by anything around him; not by his accomplishments or possessions, even if he has incalculable wealth; and he walks around as if heart-broken. Because he finds no consolation in visible things, he turns to the invisible, and receives it with a readiness to acquire it for himself sincerely and to give himself over to it.
—St. Theophan the Recluse, The Path to Salvation: A Manual of Spiritual Transformation