When God allows you to feel the sweetness of His kindness in your devotions, you must be careful not to become attached to this consolation. You must humble yourself at once, considering yourself most unworthy of any consolation, and ready to be stripped of it, to assure Him that you desire to serve and love Him, not for the consolation that He gives, either in this world or in the next, but for love of Himself and merely to please Him.
--St. John Eudes, The Four Foundations of Sanctity