See Also
Human Luck (人运, rén yùn) is the third of The Three Lucks: the fortune you generate through your own actions — effort, choices, education, relationships, discipline, and character. It is the only one of the three that is fully yours to make, and in the classical ranking it is the most decisive.
What builds it
Human Luck has no external oracle the way Heaven Luck has BaZi or Earth Luck has feng shui, because its instrument is you. It is accumulated through the ordinary machinery of a life well run: study, work, the cultivation of good relationships, and — in the more explicitly moral traditions — the accumulation of virtue (德, dé) and good deeds, which are held to improve one’s fortune over time.
Why it is ranked highest
The maxim 天时地利人和 places 人和 (rén hé, “the harmony of Man”) last in sequence but first in importance: favourable timing loses to favourable ground, and favourable ground loses to human harmony. The reasoning is that the most controllable factor is also the most decisive — the exact inverse of the fatalist’s assumption that the uncontrollable matters most.
This is where the Three Lucks stop being a theory of fortune and become an ethic. Heaven Luck is read and accepted; Earth Luck is arranged; but Human Luck is earned, and it is the lever the tradition insists you spend the most effort on. A weak birth chart in a poor environment can still be partly redeemed by conduct — and a strong one squandered without it.