Bhagavad Gītā Chapter Four verse 42

tasmād ajñānasaṃbhūtaṃ hṛtsthaṃ jñānāsinā ’tmanaḥ |
chittvāinaṃ saṃśayaṃ yogam ātiṣṭhottiṣṭha bhārata ||

ajñāna - ignoranceātman - essence; the highest personal principle of lifejñāna - knowing; knowledge; higher knowledgesaṃśaya - doubt

Commentaries and Reflections

T Krishnamacharya:

What good is the sword of wisdom (Jñāna Asinā),
to cut away the chains of doubt (Saṃśaya),
if the holder is too weak to bear it.