Whatsoever form any devotee desires to worship with faith — that (same) faith of his I make (firm and) unflinching.

yasya = whoever; yāṃ yāṃ = whichever; tanuṃ = form of a demigod; bhaktaḥ = devotee; śraddhayā = with faith; arcituṃ = to worship; icchati = desires; tasya tasya = to him; acalaṃ = steady; śraddhāṃ = faith; tāṃ = that; eva = surely; vidadhāmi = give; ahaṃ = I.;