Bhagavad Gita · Chapter 9: The Royal Knowledge and Royal Secret

Bhagavad Gita 9.3

aśraddadhānāḥ puruṣā dharmasyāsya parantapa | aprāpya māṃ nivartante mṛtyusaṃsāravartmani ||

People who have no faith in this teaching, Arjuna, do not reach me, and return to the path of death and rebirth.

Modern context

An easy practice still requires one thing: trust enough to begin. Those without it never start, and so never find out whether it works. This is true of much good advice. A walk each day, honest conversation, a few minutes of silence: all are easy, and all are neglected by people who are sure in advance they will not help. The verse is a reminder that the obstacle is often not difficulty but doubt.