अज्ञश्चाश्रद्दधानश्च संशयात्मा विनश्यति।
नायं लोकोऽस्ति न परो न सुखं संशयात्मनः।।4.40।।
4.40. But he, who is ignorant and has no faith, perishes, with his self (mind) full of doubts. Neither this world nor the other, nor happiness is for a person, who is by nature is full of doubts.
4.39-40 Sraddhavan etc. Ajnah etc. Here the idea of the passage is this : The incoming of faith and the performance of activities intending this [knowledge], both spring up soon no doubt, if one, being a believer, entertains no doubt. Therefore, one should remain being favoured by the preceptors and the scriptures, and not entertaining any doubt. For, the doubt is a destroyer of everything [good]. Indeed a person with doubt knows nothing, because he does not have faith. Hence one should remain without doubt. The subject matter that has been elaborated in this entire chapter is now summarised by a pair of the [following] verses :
Ajnashchaashraddhadhaanashcha samshayaatmaa vinashyati; Naayam loko’sti na paro na sukham samshayaatmanah.
ajñaḥ—the ignorant; cha—and; aśhraddadhānaḥ—without faith; cha—and; sanśhaya—skeptical; ātmā—a person; vinaśhyati—falls down; na—never; ayam—in this; lokaḥ—world; asti—is; na—not; paraḥ—in the next; na—not; sukham—happiness; sanśhaya-ātmanaḥ—for the skeptical soul