Answer:
The promise of restoring mankind to the perfect life that Adam and Eve lost.
Step-by-step explanation:
Right away, after Adam and Eve sinned, God promised in Genesis 3:15: " I will put enmity between you and the woman and between your offspring and her offspring. He will crush your head, and you will strike him in the heel.” This words were directed to the Serpent, Satan the Devil. God was promising that he was going to send an offspring, this was his son Jesus Christ. Satan was going to be able to strike him in the heel or to make some damage. However, Jesus Christ was going to crush him in the head, thus eliminating him completely and restoring mankind to perfection on a paradise Earth. From Genesis to Revelation, this is central theme of the Scriptures. How God has been working to fulfill his promise of giving eternal life to humans on Earth.