General
This is the first time Matthew records Jesus sharing the chain of relationship between His disciples and God the Father. If we want to have God in our lives, we must welcome Jesus and those who serve Him. There is promise both for those who value righteousness in others and also for the children of God who show brotherly love within the churches.
John captures the overarching thought well in his first letter:
1 John 5:1Everyone who believes that Jesus is the Christ has been born of God, and everyone who loves the Father loves whoever has been born of him.