He was fully convinced that God was able to do what he promised.
and being fully persuaded that, what he had promised, he was able also to perform.
Fully satisfied and assured that God was able and mighty to keep His word and to do what He had promised.
and being fully assured that what he had promised, he was able also to perform.
knowing most fully that whatever God has promised, he is also able to accomplish.
Most fully knowing, that whatsoever he has promised, he is able also to perform.
