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Those who have no faith in this Dharma (knowledge of the Self), O Parantapa (Arjuna), return to the path of this world of death without attaining Me.

People who have no faith in this dharma, scorcher of foes, do not reach me and return to the path of the round of death.

Krishna notes the consequence of rejecting this teaching. People without faith in this dharma do not reach him and instead return to the path of the round of death, mṛtyu-saṃsāra. The verse treats faith (śraddhā) as the doorway to the knowledge just praised. Without trust, even the royal secret remains closed. It is a sober note within a chapter that is otherwise strongly hopeful, reminding Arjuna that the teaching is offered but must be received.