“David continued to succeed in everything he did, for the Lord was with him.”
David had little to do with his own success. Check his resume...
The prophet Samuel anointed David as king to replace Saul (1st Samuel 16.12-13).
King Saul chose David to be his personal musician (1st Samuel 16.19).
David’s military victories were too numerous to count (1st Samuel 18.5, 7).
The children of Saul, Jonathan and Michal, loved David (1st Samuel 18.1, 20).
The entire nation, all the tribes of Israel and Judah loved David (1st Samuel 18.16).