Romanos 4
Berean Standard Bible
21being fully persuaded that God was able to do what He had promised.
Reina-Valera 1909
21Plenamente convencido de que todo lo que había prometido, era también poderoso para hacerlo.
King James Version
21And being fully persuaded that, what he had promised, he was able also to perform.
World English Bible
21and being fully assured that what he had promised, he was also able to perform.