A capable person is a person of character. Consideration for others, tolerance, self-discipline, and a commitment to truth and justice are just some of the qualities that mark an excellent character, the most priceless possession of a human being. Developing character requires spiritual struggle. It means forging your spirit by challenging your weaknesses and overcoming hardship after hardship.

From The Wisdom for Creating Happiness and Peace, part 3, revised edition, p. 196