Professing themselves to be wise, they became fools,

Professing¹ themselves²° to beª° wise,ª they became fools,ª°

Professing¹ themselues²° to beª° wise,ª they became fooles:ª°

And while thinking in themselves that they were wise, they were fools.

And, while they thought within themselves that they were wise, they became fools.

φάσκοντες εἶναι σοφοὶ ἐμωράνθησαν,

asserting to-be wisdomed they-were-dulled,