Faith is a padlock of the mind, and few keys can open it.
Whate'er the talents, or howe'er designed, We hang one jingling padlock on the mind.Alexander Pope
One has said that Christ excelled all other moralists in this, that He puts the padlock not upon the hand, but upon the heart. But He does not use the padlock at all, He renders such a thing unnecessary. He takes the tiger from the heart, and replaces it with the lamb.