'Pillar' in the Bible

But if I am long in coming, this will make clear to you what behaviour is right for men in the house of God, which is the church of the living God, the pillar and base of what is true.

Him who overcomes I will make a pillar in the house of my God, and he will go out no more: and I will put on him the name of my God, and the name of the town of my God, the new Jerusalem, which comes down out of heaven from my God, and my new name.