God cares for man’s freedom as the most precious principle that he possesses, and so in humility draws the soul to His love. But on the path to this love man comes up against the violator, the devil. The Lord allows that it should be so. God trains man’s soul, not by removing evil from his path by giving him the strength necessary to overcome all evil.
(St. Silouan the Athonite, p. 220)