अज्ञश्चाश्रद्दधानश्च संशयात्मा विनश्यति | नायं लोकोऽस्ति न परो न सुखं संशयात्मनः ||
Ajnash cha ashraddadhanash cha
The ignorant, faithless, and doubtful are destroyed and find no happiness.
Modern Application: Doubt blocks progress.
Deep Wisdom: Krishna warns about the danger of doubt and lack of faith.