Dhammapada · 12.5

Attanā hi kataṃ pāpaṃ, attajaṃ attasambhavaṃ;Abhimatthati dummedhaṃ, vajiraṃvasmamayaṃ maṇiṃ.

Attana hi katam papam, attajam attasambhavam; Abhimatthati dummedham, vajiramvasmamayam manim.

Evil done by oneself, born of self, arisen from self — crushes the fool, as a diamond grinds a precious stone.

— Dhammapada 12.5

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.