Chapter 4 · Knowledge and Renunciation of Action · Krishna said
Bhagavad Gita 4.42 — Cut doubt with knowledge
तस्मादज्ञानसम्भूतं हृत्स्थं ज्ञानासिनात्मनः। छित्त्वैनं संशयं योगमातिष्ठोत्तिष्ठ भारत ॥
tasmādajñānasambhūtaṃ hṛtsthaṃ jñānāsinātmanaḥ | chittvainaṃ saṃśayaṃ yogamātiṣṭhottiṣṭha bhārata ||
Meaning
So cut this doubt in your heart, born of ignorance, with the sword of knowledge. Take refuge in yoga, and stand up, Arjuna.