CC Ādi 5.125

sei ta’ ananta, yāṅra kahi eka kalā
hena prabhu nityānanda, ke jāne tāṅra khelā
Word for word: 
sei ta’ — that; ananta — Lord Ananta; yāṅra — of whom; kahi — I say; eka kalā — one part of the part; hena — such; prabhu nityānanda — Lord Nityānanda Prabhu; ke — who; jāne — knows; tāṅra — His; khelā — pastimes.
Translation: 
That person of whom Lord Ananta is a kalā, or part of a plenary part, is Lord Nityānanda Prabhu. Who, therefore, can know the pastimes of Lord Nityānanda?