Bhagavad Gita, Chapter 10, Verse 25

Of the great Rishis I am Bhrigu; of words I am the one syllable Om; of Yajnas I am the Yajna of Japa (silent repetition); of immovable things the Himâlaya.

Silent chanting, needing no ritual setup, is named here as a real, plainly accessible form of worship.

Naming something as simple as repeating a name alongside grand sages and sacred mountains makes a real, deliberate point about accessibility. Nothing about this practice is described as reserved for the few.