Courage.

Have the courage to use your own understanding! The energy of courage needed to overcome the obstacles to learning thrown up by both the intolerance of nature and the cowardice of the heart. Not for nothing does the ancient myth have the goddess of wisdom emerging fully armed from Jupiter’s head; for her very first action is that of a warrior. Even at her birth she must enter a bitter struggle with senses that do not wish to be torn from sweet repose.

Friedrich Schiller