'Mighty' in the Bible

Nor did he in unbelief stagger at God's promise, but became mighty in faith, giving glory to God,

being fully convinced that God had the power to do what He had promised.

Who are you to judge the servant of another? Before his own master he stands [approved] or falls [out of favor]. And he [who serves the Master—the Lord] will stand, for the Lord is able to make him stand.

Through mighty signs and wonders, by the power of the Spirit of God; so that from Jerusalem, and round about unto Illyricum, I have fully preached the gospel of Christ.