30Himἐκεῖνονit behoovesδεῖto increaseαὐξάνειν,meἐμὲhoweverδὲto decreaseἐλαττοῦσθαι.
It is necessary for Him to increase, but [for] me to decrease.
ἐλαττοῦσθαι
ἐλαττόω
I make less (inferior).