caturtha - fourth; ślokera - of the verse; artha - the meaning; haila - was; su-niścite - very surely; avatīrṇa hailā - incarnated; gaura - Lord Caitanya Mahāprabhu; prema - love of God; prakāśite - to manifest.

Thus I have surely determined the meaning of the fourth verse. Lord Gaurāṅga [Lord Caitanya] appeared as an incarnation to preach unalloyed love of God.