But we know that when he appears, we shall be like him, for we shall see him as he is. A good confidence is a realiztion and an assurance that God loves you, that he has given you talents and gifts and the ability to use them for him, that he has offered you salvation and eternal life in heaven. Knowing this gives you complete certainty that your life can have meaning now and forever. But after Uzziah became powerful, his pride led to his downfall. He was unfaithful to the LORD his God, and entered the temple of the LORD to burn incense on the altar of incense.
Pride is the ingredient that causes our confidence to become arrogant and cocky.
If we think we can do it ourselves, when we stop seeking God's help - these are the warning signs that confidence has turned to arrogance. But blessed is the man who trusts in the LORD, whose confidence is in him.