Dhammapada · 3.8

Kumbhūpamaṃ kāyamimaṃ viditvā, nagarūpamaṃ cittamidaṃ ṭhapetvā;Yodhetha māraṃ paññāvudhena, jitañca rakkhe anivesano siyā.

kumbhupamam kayam-imam viditva, nagarupamam cittam-idam thapetva; yodhetha maram pannavudhena, jitanca rakkhe anivesano siya.

Knowing this body to be fragile as a clay pot, and having established this mind as a fortified city, wage war against Mara with the weapon of wisdom — and having won, guard the victory, without settling-place.

— Dhammapada 3.8

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.