Dhammapada · 17.13
Manopakopaṃ rakkheyya, manasā saṃvuto siyā;Manoduccaritaṃ hitvā, manasā sucaritaṃ care.
Manopakopam rakkheyya, manasa samvuto siya; Manoduccaritam hitva, manasa sucaritam care.
Guard against mental anger, be restrained in mind. Abandoning mental misconduct, practice mental good conduct.
— Dhammapada 17.13
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.