As the physically weak man can make himself strong by careful and patient training, so the man of weak thoughts can make them strong by exercising himself in right thinking.
正如体弱的人能通过细致耐心的训练变得强健,思想软弱的人也能通过练习正确思考使自己坚强。
— James Allen · As a Man Thinketh (1903) · Thought and Purpose —