Zǐyuē: “Wú shí yǒu wǔ ér zhì yú xué, sānshí ér lì, sìshíérbùhuò, wǔshí ér zhī tiānmìng, liùshí ér ěr shùn, qīshí ér cóngxīnsuǒyù, bù yújǔ.”[Pinyin]
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.