ajñaś cāśraddadhānaś ca
ajñaś cāśraddadhānaś ca saṁśayātmā vinaśyati |
nāyaṁ loko’sti na paro na sukhaṁ saṁśayātmanaḥ ||
(Śrīmad Bhagavad-gītā: 4.40)
“One who is ignorant [i.e., devoid of knowledge of śāstra], devoid of śraddhā [as a result of observing differences of opinion about the meaning of śāstra], and doubtful [regarding whether something will actually lead to success] is ruined. Neither this world [i.e., any future prospect of well-being in this world], nor the next [i.e., any prospect of attaining a desirable afterlife], nor happiness [i.e., any present sense of satisfaction] exist for one who is doubtful.”