Bhagavad Gītā Chapter Four verse 40

ajñaścāśraddadhānaśca saṃśayātmā vinaśyati |
nāyaṃ loko ’sti na paro na sukhaṃ saṃśayātmanaḥ ||

saṃśaya - doubtātman - 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.