Bhagavad Gītā Chapter Four verse 40

अज्ञश्चाश्रद्दधानश्च संशयात्मा विनश्यति ।
नायं लोकोऽस्ति न परो न सुखं संशयात्मनः ॥ ४० ॥

ajñaścā-śraddadhānaśca saṃśaya-ātmā vinaśyati |
nāyaṃ loko ’sti na paro na sukhaṃ saṃśaya-ātmanaḥ ||

saṃśaya - uncertainty, irresolution, doubt, scruple, misgiving, suspicionātman - essence; the highest personal principle of life; the individual soul, selfsukha - pleasure; happiness; agreeable; ease; comfortable; pleasant

Commentaries and Reflections

Commentary by T Krishnamacharya:

Saṃśaya is the Fire that consumes Wisdom.”