The New John Gill Exposition of the Entire BibleRomans 4:22
And therefore it was imputed to him for righteousness.
because his faith was strong, and he had a full assurance of it, but
because it was right, resting on the promise of God, and relying upon
his power and faithfulness to perform it; for though the righteousness
of faith is not imputed to any sort of believers, not to mere nominal
ones, yet to all such as have true faith, though it may be but weak;
for faith, as to nature, kind, and object, though not as to degree, is
the same in all true believers, and the same righteousness is imputed
to one as to another.