After you have made a decision that is pleasing to God, the Devil may try to make you have second thoughts. Intensify your prayer time, meditation, and good deeds. For if Satan's temptations merely cause you to increase your efforts to grow in holiness, he'll have an incentive to leave you alone.
-- St. Ignatius of Loyola
(pic courtesy of ncregister.com, quote courtesy of ewtn.com)