Whatever difficulty there is in the mind is only mind, not otherwise; based on the differentiation of the mind one says there is difficulty, not otherwise.

The reduction kaṣṭa = citta-mātra — difficulty = mere mind — is citta-mātra-vāda applied to suffering. It is not that the world does not exist; it is that kaṣṭa does not exist outside the mind. Anyatva — differentiation — is the mechanism: by differentiating “this is difficulty” from “this is not difficulty,” one creates kaṣṭa. Without differentiation there is no difficulty; there is only citta, only flow. Brūyāt — one says — is passive: not someone says, but “it is said,” language itself generates the category. Na cānyathā — not otherwise — is absolute: there is no journey, no grace, no circumstance that creates difficulty without the mind that differentiates it as such.