Dhammapada · 5.13
Yāvadeva anatthāya, ñattaṃ bālassa jāyati;Hanti bālassa sukkaṃsaṃ, muddhamassa vipātayaṃ.
Yavadeva anatthaya, nattam balassa jayati; Hanti balassa sukkamsam, muddhamassa vipatayam.
The fool's knowledge arises only for his own ruin — it destroys his good fortune and cleaves his head.
— Dhammapada 5.13
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.