《 Sānzìjīng 》 lǐ yǒu yí jù: " sāncái zhě, tiān dì rén. "
The Three Character Classic has the line: 'The Three Powers are heaven, earth and man.'
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三才 is the idea behind 天时地利人和: heaven supplies the right moment (天时), earth the right ground (地利) and people the unity (人和) that 孟子 (Mencius) ranked above the other two.
