Bhagavad Gita 4.40

अज्ञश्चश्रद्धाधानश्च संशयात्मा विनश्यति |
नायं लोकोऽस्ति न परो न सुखं संशयात्मन:

Translation

But persons who possess neither faith nor knowledge, and who are of a doubting nature, suffer a downfall. For the skeptical souls, there is no happiness either in this world or the next.