Bhagavad Gītā Chapter Four verse 42
tasmād ajñānasaṃbhūtaṃ hṛtsthaṃ jñānāsinā ’tmanaḥ |
chittvāinaṃ saṃśayaṃ yogam ātiṣṭhottiṣṭha bhārata ||
Commentaries and Reflections
Commentary by 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.