Ephesians 1:14 Which is the earnest of our inheritance until the
redemption of the purchased possession, unto the praise of his glory.
Earnest money is a good faith payment made in advance for real estate or a contract of employment to demonstrate that the buyer is earnest or serious about his intentions to buy. In ancient times, the earnest payment was called an earnest penny, and also known as Arles penny, God's penny. It was money paid to legally bind a deal, or the purchase or hiring of a servant. The wording is easier to read in the New King James, and can be seen by hovering over the reference above.
This passage tells us that the Holy Spirit of promise(taken from verse 13) that we have received here on Earth is only the minescule fraction of what has been promised us in heaven. This means that we can take the idea that "it's going to get so much better than this in heaven" two directions. If you are having it tough... it's going to be better in heaven. If you are in pain, or suffer death, or loss... it's going to be better in heaven. If, on the other hand, you have the greatest comfort... it's going to be better in heaven. If you have unimaginable happiness here and now... it's going to be better in heaven! What an awesome promise that is for us. Hebrews 11:39 says that God's plan was not completed with the Patriarchs. The heros of faith did not receive the inheritance before they died. They only received the promise. Is Heaven an Upgrade? Remember... we are not home yet!