The key of praise is a must for every Christian, we must tends to know what dooor did praise opennfor David, first it open the door of the palace. It was effortlessly, without struggle or stress. The book of Samuel told us this.
Second was the door of power. There was enough power to bring down goliath. David fought more than sixty battle and lost none.
Potential also comes with praise, as David was a lion killer, he was a strategist. Investor and inventor. He served his generation fully.