Sanskrit
क्षिप्रं भवति धर्मात्मा शश्वच्छान्तिं निगच्छति । कौन्तेय प्रतिजानीहि न मे भक्तः प्रणश्यति ॥
kṣipraṃ bhavati dharmātmā śaśvacchāntiṃ nigacchati kaunteya pratijānīhi na me bhaktaḥ praṇaśyati
Translation
Speedily he becometh dutiful and goeth to eternal peace; O Kaunteya, know thou for certain that My devotee perisheth never.
Annie Besant · The Bhagavad-Gita, translated by Annie Besant (4th ed., 1922) — Wikisource · Public Domain
Explanation
Delivers on verse 30’s claim with a guarantee: the reform is described as fast (kṣipram) and lasting (śāśvat śāntim, eternal peace), and Krishna states outright — pratijānīhi, know thou for certain — that a devotee is never lost. The emphatic first-person promise is rhetorically unusual for a text that more often argues than asserts, and it sets the tone for the two verses that follow, which extend the same guarantee explicitly across caste lines.