Dhammapada · 6.5

Udakaṃ hi nayanti nettikā, usukārā namayanti tejanaṃ;Dāruṃ namayanti tacchakā, attānaṃ damayanti paṇḍitā.

Udakam hi nayanti nettika, usukara namayanti tejanam; Darum namayanti tacchaka, attanam damayanti pandita.

Irrigators channel water; fletchers shape arrows; carpenters bend wood; the wise master themselves.

— Dhammapada 6.5

Source: Pali text from the Khuddaka Nikāya of the Pali Canon (oldest extant Buddhist scripture, compiled c. 3rd century BCE). Public-domain English readings drawn from F. Max Müller's translation in Sacred Books of the East, Vol X (1881) and the Buddhist Publication Society's freely-licensed Acharya Buddharakkhita rendering.