The Greatest DenominatorGreatest Denominator

Mencius 6B.15

ConfucianismMencius 6B.15
… Thus, when Heaven is about to confer a great office on any man, it first exercises his mind with suffering, and his sinews and bones with toil. It exposes his body to hunger, and subjects him to extreme poverty. It confounds his undertakings. By all these methods it stimulates his mind, hardens his nature, and supplies his incompetencies. …

故天將降大任於是人也,必先苦其心志,勞其筋骨,餓其體膚,空乏其身,行拂亂其所為,所以動心忍性,曾益其所不能。

The same idea in other traditions


SikhismSGGS Ang 1384
Let patience be your purpose in life; implant this within your being. In this way, you will grow into a great river; you will not break off into a tiny stream.
HinduismBhagavad Gita 2.47
Your business is with action alone; not by any means with fruit. Let not the fruit of action be your motive (to action). Let not your attachment be (fixed) on inaction.