Good ReasonsAtthavasasutta

“Mendicants, taking three reasons into consideration provides quite enough motivation to teach Dhamma to another.“Tayo, bhikkhave, atthavase sampassamānena alameva paresaṁ dhammaṁ desetuṁ. What three?Katame tayo? When the teacher understands the meaning and the teaching.Yo dhammaṁ deseti so atthappaṭisaṁvedī ca hoti dhammappaṭisaṁvedī ca. When the audience understands the meaning and the teaching.Yo dhammaṁ suṇāti so atthappaṭisaṁvedī ca hoti dhammappaṭisaṁvedī ca. When both the teacher and the audience understand the meaning and the teaching.Yo ceva dhammaṁ deseti yo ca dhammaṁ suṇāti ubho atthappaṭisaṁvedino ca honti dhammappaṭisaṁvedino ca.

Taking these three reasons into consideration provides quite enough motivation to teach Dhamma to another.”Ime kho, bhikkhave, tayo atthavase sampassamānena alameva paresaṁ dhammaṁ desetun”ti.