God's people will be united as one in heart and not filled with divisions.
Behold, I will send you Elijah the prophet before the coming of the great and dreadful day of the LORD: And he shall turn the heart of the fathers to the children, and the heart of the children to their fathers,...For then will I turn to the people a pure language, that they may all call upon the name of the LORD, to serve him with one consent.
Malachi 4:5,6/Zephaniah 3:9