Appamādasutta
“Yāvatā, bhikkhave, sattā apadā vā dvipadā vā catuppadā vā bahuppadā vā rūpino vā arūpino vā saññino vā asaññino vā nevasaññināsaññino vā, tathāgato tesaṁ aggamakkhāyati arahaṁ sammāsambuddho; evamevaṁ kho, bhikkhave, ye keci kusalā dhammā, sabbe te appamādamūlakā appamādasamosaraṇā. Appamādo tesaṁ aggamakkhāyati.
Diligence
“Mendicants, the Realized One, the perfected one, the fully awakened Buddha, is said to be the best of all sentient beings—be they footless, with two feet, four feet, or many feet; with form or formless; with perception or without perception or with neither perception nor non-perception. In the same way, all skillful qualities are rooted in diligence and meet at diligence, and diligence is said to be the best of them.