Book 2: 《為政》 Wei Zheng (Governance)
《為政》 Passage 2.4
子曰：「吾十有五而志于學，三十而立，四十而不惑，五十而知天命，六十而耳順，七十而從心所欲，不踰矩。」
Legge Translation (1861)
The Master said: "At fifteen, I had my mind bent on learning.At thirty, I stood firm.
At forty, I had no doubts.
At fifty, I knew the decrees of Heaven.
At sixty, my ear was an obedient organ for the reception of truth.
At seventy, I could follow what my heart desired, without transgressing what was right."