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

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

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

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

YLT - and having been fully persuaded that what He hath promised He is able also to do:

Notes