'Firm' in the Bible

The only thing that matters is that you continue to live as good citizens in a manner worthy of the gospel of the Messiah. Then, whether I come to see you or whether I stay away, I may hear all about you that you are standing firm in one spirit, struggling with one mind for the faith of the gospel,

Therefore, my dear brothers whom I long for, my joy and my victor's crown, this is how you must stand firm in the Lord, dear friends.