G1226–διαβεβαιόω–diabebaioō

They are ambitious to be teachers of the Law, although they do not understand either their own words or what the things are about which they make such confident assertions.

διαβεβαιοῦνται. diabebaiountai “they confidently assert.”

This is a faithful saying, and on these various points I would have you insist strenuously, in order that those who have their faith fixed on God may be careful to set an example of good actions. For these are not only good in themselves, but are also us

διαβεβαιοῦσθαι diabebaiousthai “to affirm strongly”