Yesterday at church Bro. Daniel (our associate pastor, and the pastor's son) preached a sermon called "This Day". He wrote it on the airplane when returning from Bible School for his brother's unexpected funeral. This was the second time he preached this sermon. Here is a little of what I gleaned from the sermon.
We all know the story of David and Goliath, right? Well there is a lot to be learned from that story and our lives. The Philistines had Goliath. He was over 9 feet tall and every day for 40 days, he taunted the Israelites before a battle was going to take place. He asked them that who, this day would be willing to fight him. None of the Israelites would take on such a man.
Young David was tending the sheep while his brothers were away fighting the battle. His father had him take some food to his brothers and to their captains. When David got there, he is described as a small man, thin and not really strong looking. While talking to his brothers, Goliath comes forward YET AGAIN to taunt the Israelites. It gets David's attention.
Here is an excerpt from the KJV. (I added some bolding to touch on a few specific verses:
I Samuel Chapter 17:
 And as he talked with them, behold, there came up the champion, the Philistine of Gath, Goliath by name, out of the armies of the Philistines, and spake according to the same words: and David heard them.
 And all the men of Israel, when they saw the man, fled from him, and were sore afraid.
 And the men of Israel said, Have ye seen this man that is come up? surely to defy Israel is he come up: and it shall be, that the man who killeth him, the king will enrich him with great riches, and will give him his daughter, and make his father's house free in Israel.
 And David spake to the men that stood by him, saying, What shall be done to the man that killeth this Philistine, and taketh away the reproach from Israel? for who is this uncircumcised Philistine, that he should defy the armies of the living God?
 And the people answered him after this manner, saying, So shall it be done to the man that killeth him.
 And Eliab his eldest brother heard when he spake unto the men; and Eliab's anger was kindled against David, and he said, Why camest thou down hither? and with whom hast thou left those few sheep in the wilderness? I know thy pride, and the naughtiness of thine heart; for thou art come down that thou mightest see the battle.
 And David said, What have I now done? Is there not a cause?
 And he turned from him toward another, and spake after the same manner: and the people answered him again after the former manner.
 And when the words were heard which David spake, they rehearsed them before Saul: and he sent for him.
 And David said to Saul, Let no man's heart fail because of him; thy servant will go and fight with this Philistine.
 And Saul said to David, Thou art not able to go against this Philistine to fight with him: for thou art but a youth, and he a man of war from his youth.
 And David said unto Saul, Thy servant kept his father's sheep, and there came a lion, and a bear, and took a lamb out of the flock:
 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.
 Thy servant slew both the lion and the bear: and this uncircumcised Philistine shall be as one of them, seeing he hath defied the armies of the living God.
 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 unto David, Go, and the LORD be with thee.
 And Saul armed David with his armour, and he put an helmet of brass upon his head; also he armed him with a coat of mail.
 And David girded his sword upon his armour, and he assayed to go; for he had not proved it. And David said unto Saul, I cannot go with these; for I have not proved them. And David put them off him.
 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 scrip; and his sling was in his hand: and he drew near to the Philistine.
 And the Philistine came on and drew near unto David; and the man that bare the shield went before him.
 And when the Philistine looked about, and saw David, he disdained him: for he was but a youth, and ruddy, and of a fair countenance.
 And the Philistine said unto David, Am I a dog, that thou comest to me with staves? And the Philistine cursed David by his gods.
 And the Philistine said to David, Come to me, and I will give thy flesh unto the fowls of the air, and to the beasts of the field.
 Then said David to the Philistine, Thou comest to me with a sword, and with a spear, and with a shield: but I come to thee in the name of the LORD of hosts, the God of the armies of Israel, whom thou hast defied.
 This day will the LORD deliver thee into mine hand; and I will smite thee, and take thine head from thee; and I will give the carcases of the host of the Philistines this day unto the fowls of the air, and to the wild beasts of the earth; that all the earth may know that there is a God in Israel.
 And all this assembly shall know that the LORD saveth not with sword and spear: for the battle is the LORD's, and he will give you into our hands.
 And it came to pass, when the Philistine arose, and came and drew nigh to meet David, that David hasted, and ran toward the army to meet the Philistine.
 And David put his hand in his bag, and took thence a stone, and slang it, and smote the Philistine in his forehead, that the stone sunk into his forehead; and he fell upon his face to the earth.
 So David prevailed over the Philistine with a sling and with a stone, and smote the Philistine, and slew him; but there was no sword in the hand of David.
 Therefore David ran, and stood upon the Philistine, and took his sword, and drew it out of the sheath thereof, and slew him, and cut off his head therewith. And when the Philistines saw their champion was dead, they fled.
I added some bold to verses that stuck out to me. What will you chose to do THIS DAY?
First, David asked his brothers "Is there not a cause?" WHY wouldn't anyone go fight this guy. This uncircumsized guy who is insulting God?
Second, David goes to King Saul when summoned and has to turn down his armor because it is too heavy for him. So David goes to battle with Goliath protected by God (which is enough).
Third, when Goliath asks if he is a dog, David replies that the battle is the Lords not ours and the Lord will prevail. Note that Goliath was sitting down? He wasn't even standing up.
Fourth, vice standing there waiting for Goliath, David RUNS TOWARD him. God wants us to run TOWARD our problems and our Goliaths, not from them.
What is your Goliath? What is keeping you from doing what you need to do? What will you do THIS DAY?
Personally, one of my "Goliath's" is my weight and eating. I do not eat as healthy as I should. I know that ONLY through the Lord can I do this. I have to claim the victory through Jesus Christ or else it's all in vain. THIS DAY, I am back on track. THIS DAY, I am starting over. THIS DAY, I am claiming that the Lord will help me to be healthy.
In the end David did defeat Goliath and David's servents eventually (later in the book) killed Goliath's four children. The Lord can help us to overcome ANYTHING if we only keep our eyes on HIM and not on our own shortcomings.