Bhagavad Gita, Chapter 4, Verse 39

The man with faith, the devoted, the master of one's senses, attains this knowledge. Having attained knowledge one goes at once to the Supreme Peace.

Genuine trust, paired with real discipline, is what actually opens this up. Neither one alone gets there.

This names the real combination required: sincere faith and consistent inner discipline working together. Neither one substitutes for the other, and together they're described as leading somewhere genuinely lasting.