Yet it is impossible to discover the will of God unless we keep the commandments, thereby cutting off all pleasure and personal will, and unless we endure all the pain that this involves. As has been said, pleasure and pain are born of folly, and they give rise to all evil. For the foolish man loves himself and cannot love his brother or God; he can neither refrain from pleasure or from the desires that give him satisfaction, nor can he endure pain. Sometimes he gets what he wants, and then he is filled with pleasure and elation; sometimes he does not get it and, completely dominated by the pain which this engenders, he is cast down and dejected, experiencing a foretaste of hell.
~St Peter of Damaskos
Prayerful Life 