и будучи вполне уверен, что Он силён и исполнить обещанное.
being fully persuaded that God had power to do what he had promised.
fully convinced that God was able to do what he had promised.
and being fully assured that what God had promised, He was able also to perform.
He was fully convinced that God is able to do whatever he promises.
And being fully persuaded that, what he had promised, he was able also to perform.
and being fully convinced that what He had promised He was also able to perform.
and being fully persuaded that what he has promised he is able also to do;