The organism learns not only what to do but also what leads to what.
成功是最好的报复。
Force has no place where there is need of skill.
当他未得到官职的时候,唯恐得不到;已经得到了官职,又唯恐丢失掉。假若害怕丢失掉,便什么坏事都能干出来。