The Gospel:

Imagine this with me: You go to your favorite restaurant to buy $100 worth of delicious food, and when you get there, a man with unlimited money asks to pay for all of your food. When he asks this, you decline because you think that you have enough money to pay for all of the food that you ordered. As time goes by, you realize that you actually don't have enough money to pay for the food. After you realize this, the man offers to pay for the food again, and this time you accept the money, and the debt of $100 is paid. 

The food in this scenario represents sin. Anytime we break one of God’s divine laws (which we do a lot) would be considered sin. Since God is perfectly just, we have a price to pay for our sins. The price of the food ($100) represents the price we would have to pay for our sin, which is spending eternity away from God in a place full of suffering called Hell. The man in this story represents God, and the money he has represents the sacrifice of Jesus Christ. God sent himself to Earth in the flesh, as Jesus, to die for the sins of the world by being crucified on a cross. The thing is, the money doesn't pay for the food unless you actually accept it from the kind man. Similarly, the sacrifice of Jesus doesn't actually pay for one’s sins until he accepts the sacrifice by putting faith in Jesus Christ.

The issue is, many people in the world truly believe in Heaven and Hell, but they think the amount of "good" things they do will determine whether or not they will go to Heaven. In reality, the only way to go to Heaven is by the grace of God through our faith in Jesus Christ. As followers of Christ, we have an obligation to tell the world about this good news. None of us are able to pay for our sin, but we have a voice to tell everyone about a man who is more than able to pay for it all.