If you think that your enthusiasm need work, that it hasn't been growing apace with your progress on the other principles, you can stimulate it with some simple exercises 如果認(rèn)為你的熱忱應(yīng)該發(fā)生作用,而它卻跟不上你在發(fā)揮其他原則方面的進(jìn)度時(shí),你可以利用一些簡(jiǎn)單的練習(xí)來(lái)刺激你的熱忱。