David then took up residence in the fortress and called it the City of David. He built up the area around it, from the supporting terraces inward. And he became more and more powerful, because the LORD God Almighty was with him. 2 Samuel 5:9-10
David had just conquered the fortress of Zion, where the Jebusites lived. He made it his base. Second Samuel tells us that David was becoming more and more powerful because the Lord was with him. It certainly is an important point to note because without the Lord, David was nothing. It would be very easy for King David to forget that. He had everything going for him as a king. And he was gaining power.
It's the same for us. Without the Lord, we are nothing. It's often difficult for us in the West to hear that because we like thinking that we can do things on our own. God gives us talents and gifts to do those things, but ultimately He gets the glory. We need to be reminded of this early and often.