Bhagavad Gita Chapter 2.3
klaibyaḿ mā sma gamaḥ pārtha
naitat tvayy upapadyate
kṣudraḿ hṛdaya-daurbalyaḿ
tyaktvottiṣṭha parantapa
Translation
O son of Pritha, do not yield to this degrading impotence. It does not become you. Give up such petty weakness of heart and arise, O chastiser of the enemy.