Cūḷaviyūhasuttanidadesa

Suttapiṭaka · Khuddakanikāya · Mahāniddesa · Vol. 29 · Section 567

[567] By the very same means by which he regards another as "a fool," by that same means he declares himself to be "skilled"; proclaiming himself skilled on his own account, he despises another, and yet speaks in just the same way.

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.