A competent and self-confident person is incapable of jealousy in anything. Jealousy is invariably a symptom of neurotic insecurity.
一个有能力、有自信的人，不会忌妒别人。妒忌总是神经质而缺乏自信的表现。

——Robert A. Heinlein
——罗伯特·海莱茵