子曰:“吾十有五而志于学,三十而立,四十而不惑,五十而知天命,六十而耳顺,七十而从心所欲,不踰矩。”
The Master said, “From fifteen, my heart-and mind was set upon learning; from thirty I took my stance; from forty I was no longer doubtful; from fifty I realized the propensities of tian ( tianming 天命); from sixty my ear was attuned; from seventy I could give my heart-and-mind free rein without overstepping the boundaries.” [2]