Conceit has no room for humility; confidence relies on experience and trust beyond the self.
David the shepherd boy was not conceited when he boldly offered to challenge Goliath. He had killed a lion and a bear and he knew he could rely on God. When King Saul offered his expensive armor, David soon found out that he could not move in that gear (1 Samuel 17:35-40 1 Samuel 17:35-40 35 And I went out after him, and smote him, and delivered it out of his mouth: and when he arose against me, I caught him by his beard, and smote him, and slew him.
36 Your servant slew both the lion and the bear: and this uncircumcised Philistine shall be as one of them, seeing he has defied the armies of the living God.
37 David said moreover, The LORD that delivered me out of the paw of the lion, and out of the paw of the bear, he will deliver me out of the hand of this Philistine. And Saul said to David, Go, and the LORD be with you.
38 And Saul armed David with his armor, and he put an helmet of brass on his head; also he armed him with a coat of mail.
39 And David girded his sword on his armor, and he assayed to go; for he had not proved it. And David said to Saul, I cannot go with these; for I have not proved them. And David put them off him.
40 And he took his staff in his hand, and chose him five smooth stones out of the brook, and put them in a shepherd’s bag which he had, even in a money; and his sling was in his hand: and he drew near to the Philistine.
American King James Version×). But he knew what he could do from a distance with a well-aimed rock from his sling.
David knew he was a boy in the eyes of the men, but no other man came forth to face Goliath. David was alarmed. His offer was made out of confidence in his ability to run and sling a stone, as well as his faith in God. There was no room for boasting, and none is found in David’s words. It is not a sin to have confidence in one’s abilities. God will not bless conceit and arrogance, but He loves one who has put his mind and body to work and is thankful to his Creator for the help He has given. His confidence is in God and in himself.