Bhagavad Gita Chapter 18, Verse 58

मच्चित्तः सर्वदुर्गाणि मत्प्रसादात्तरिष्यसि | अथ चेत्त्वमहङ्कारान्न श्रोष्यसि विनङ्क्ष्यसि ||

maccittaḥ sarvadurgāṇi mat-prasādāt tariṣyasi atha cet tvam ahaṅkārān na śroṣyasi vinaṅkṣyasi

With your mind fixed on Me, you will cross all obstacles by My grace. But if, from ego, you do not listen, you will perish.

Krishna gives both assurance and warning. 'Maccittaḥ sarvadurgāṇi mat-prasādāt tariṣyasi'—with your mind fixed on Me (mat-cittaḥ), you will cross (tariṣyasi) all obstacles (sarva-durgāṇi) by My grace (mat-prasādāt). 'Atha cet tvam ahaṅkārān na śroṣyasi vinaṅkṣyasi'—but if (atha cet), from ego (ahaṅkārāt), you do not listen (na śroṣyasi), you will perish (vinaṅkṣyasi). This is the key teaching: if you keep your mind fixed on Krishna, you will overcome all obstacles by His grace. But if you act from ego and don't listen to His instructions, you will perish. This emphasizes the importance of surrender and listening to the Supreme, versus acting from ego and ignoring His guidance.