"Don't complain about heaven, don't blame others" comes from "The Analects of Confucius·Xianwen".
The original text is as follows: "I don't blame God, and I don't blame people. I will learn from my studies and reach higher levels, and the one who knows me is Heaven!" The meaning of this sentence is: I don't blame God, and I don't blame people. Learn rituals and music and reach the destiny of heaven. The only one who understands me is heaven!
The quote comes from Mencius. ②Sure. The day before yesterday, Yu heard the masters say: A gentleman does not complain about heaven, but does not blame others.'" ①Chong Yu: Disciple of Mencius. ②Yu: Pleasure, joy.
Translation: "Mencius left Qi. On the way, Chong Yu asked: 'Sir, he seems a little unhappy. I have heard you say in the past: A gentleman does not complain about heaven or blame others.'
'Why is this happening today? ”