"After she had weaned Lo-Ruhamah, Gomer had another son. Then the Lord said, 'Call him Lo-Ammi, for you are not my people, and I am not your God.'" NIV translation
Now, we see that not only did Gomer have a daughter that was not Hosea's but she also had a son. Once again, God spoke and had him give the son a specific name for a specific reason. Lo-Ammi means "not my people" and just as he was not Hosea's son, God is using him to tell the nation of Israel that they are no longer His people. We must understand that they turned their backs on God just as Gomer turned her back on Hosea and both of them were acts of adultery in God's eyes. For us today, this passage can remind us to check ourselves and our faith to see if we are being true to God.
It is easy to look back and recognize the adultery of Israel with their false altars and false places of worship but we also must ask ourselves if we are serving something other than the very God that created us.
"'Yet the Israelites will be like the sand on the seashore, which cannot be measured or counted. In the place where it was said to them, "You are not my people," they will be called "sons of the living God."'" NIV translation
What hope we see here in the fact that God is still calling them to repentance and standing ready to forgive the Israelites of their adultery. That same hope is available to us as well. No matter how far we have strayed from God or what we may have done, He still asks us to come back and accept His forgiveness.
"The people of Judah and the people of Israel will be reunited, and they will appoint one leader and will come up out of the land, for great will be the day of Jezreel." NIV translation
This verse refers to events that are yet to occur and are described in the book of Revelation. The "day of Jezreel" refers to what we call Armageddon and, in Revelation 16, we are told that the nations come against God at this place which is in the Jezreel Valley. Great will be the day there as the final battle is waged and God's people will be reunited.