From A Chinese Garden of Serenity (1959), by Hung Tzu-ch’eng, translated by Chao Tze-chiang:

A man can apprehend Truth at another’s intimation, but he will stray from it. Hence that is not so enlightening as apprehending it completely by himself. And he can secure a pleasure from an extraneous source, but he will lose it. Therefore that is less secure than an ecstasy from within.