If you are looking for a good underdog story, the story of David and Goliath is a great one. It is often one of the first stories we learn as children because it shows that even young people can be used by God. In this story, we see that David had insight that his brothers and the other troops didn’t have. King Saul and his army were in a battle with the Philistines. David’s father Jesse had sent David to the battle with food and told him to return with word on how the battle was going. When David arrived, he saw Goliath taunting the Israelite army and David spoke these words – “For who is this uncircumcised Philistine, that he should defy the armies of the living God?” By calling Goliath an uncircumcised Philistine, David was revealing to us why he knew he could defeat Goliath. David knew Goliath was not in covenant with the one true living God. David had God on his side and Goliath didn’t. David was set apart for God’s service and Goliath wasn’t. That’s all that mattered. Size, armor, and smack talk could not compare with covenant! Of course today we are under a new covenant, one that involves circumcision of the heart or the inner man, not the outer man. Through Jesus Christ, we can all be included in that covenant with the living God! And by God’s Holy Spirit our hearts are changed. You may be facing some pretty fierce looking foes. But when you are in covenant with the living God, you can stand confidently before them and declare “Who do you think you are to defy a child of the living God!”
Genesis 17:10-11 (NKJV)
10 This is My covenant which you shall keep, between Me and you and your descendants after you: Every male child among you shall be circumcised; 11 and you shall be circumcised in the flesh of your foreskins, and it shall be a sign of the covenant between Me and you.
Romans 2:28-29 (NKJV)
28 For he is not a Jew who is one outwardly, nor is circumcision that which is outward in the flesh; 29 but he is a Jew who is one inwardly; and circumcision is that of the heart, in the Spirit, not in the letter; whose praise is not from men but from God.
Romans 2:28-29 (NLT)
28 For you are not a true Jew just because you were born of Jewish parents or because you have gone through the ceremony of circumcision. 29 No, a true Jew is one whose heart is right with God. And true circumcision is not merely obeying the letter of the law; rather, it is a change of heart produced by God’s Spirit. And a person with a changed heart seeks praise from God, not from people.