'Justified' in the Bible

"Therefore let it be known to you, men [and] brothers, that through this one forgiveness of sins is proclaimed to you, and from all [the things] from which you were not able to be justified by the law of Moses,

And by him all that believe are justified from all things, from which ye could not be justified by the law of Moses.

But just as Paul was about to speak, Gallio said to the Jews, "If it were a matter of some crime or serious piece of villainy, I would have been justified in accepting the complaint of you Jews,