The most powerful weapon to conquer the devil is humility. For, as he does not know at all how to employ it, neither does he know how to defend himself from it.
As quoted in A Year with the Saints (1891) by Anonymous, p. 47
However great the work that God may achieve by an individual, he must not indulge in self-satisfaction. He ought rather to be all the more humbled, seeing himself merely as a tool which God has made use of.Vincent De Paul