Guhaṭṭhakasuttaniddesa

Suttapiṭaka · Khuddakanikāya · Mahāniddesa · Vol. 29 · Section 45

[45] Therefore indeed, a person should train right here: whatever one might know as uneven (visama) in the world, one should not, on account of that, conduct oneself unevenly; for the wise have said this life is brief.

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.