Purābhedasuttanidadesa

Suttapiṭaka · Khuddakanikāya · Mahāniddesa · Vol. 29 · Section 383

[383] One who is without anger, not trembling with fear, not boastful, free from remorse, speaking with wisdom, not restless — he indeed, restrained in speech, is a sage (muni).

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.