Bhagavad Gita Chapter 4.42
tasmād ajñāna-sambhūtaḿ
hṛt-sthaḿ jñānāsinātmanaḥ
chittvainaḿ saḿśayaḿ yogam
ātiṣṭhottiṣṭha bhārata
Translation
Therefore the doubts which have arisen in your heart out of ignorance should be slashed by the weapon of knowledge. Armed with yoga, O Bharata, stand and fight.