Sukhitasutta

Sāvatthiyaṁ viharati. “Anamataggoyaṁ, bhikkhave, saṁsāro …pe… yaṁ, bhikkhave, passeyyātha sukhitaṁ susajjitaṁ, niṭṭhamettha gantabbaṁ: ‘amhehipi evarūpaṁ paccanubhūtaṁ iminā dīghena addhunā’ti. Taṁ kissa hetu? Anamataggoyaṁ, bhikkhave, saṁsāro. Pubbā koṭi na paññāyati …pe… alaṁ vimuccitun”ti. Dutiyaṁ.

At Sāvatthī. “Mendicants, this transmigration has no known beginning. … When you see someone in a good way, in a happy state, you should conclude: ‘In all this long time, we too have undergone the same thing.’ Why is that? This transmigration has no known beginning. … This is quite enough for you to become disillusioned, dispassionate, and freed regarding all conditions.”