G1226–διαβεβαιόω–diabebaioō

Desiring to be teachers of the law; understanding neither what they say, nor concerning what they affirm.

διαβεβαιοῦνται. diabebaiountai “they confidently assert.”

This is a faithful saying, and these things I will that thou affirm constantly, that they who have believed in God may be careful to maintain good works. These things are good and profitable to men.

διαβεβαιοῦσθαι diabebaiousthai “to affirm strongly”