and being fully assured that what he had promised, he was able also to perform.

And being certain that God was able to keep his word.

και πεποιθως οτι εκεινο, το οποιον υπεσχεθη, ειναι δυνατος και να εκτελεση.

And being fully persuaded that, what he had promised, he was able also to perform.