That their hearts might be comforted, being knit together in love, and unto all riches of the full assurance of understanding, to the acknowledgement of the mystery of God and of the Father, and of Christ;
Paul is addressing the believers in the Colossian church which was in Colosse expressing to then how they are knitted together in love and all are linked through God's Spirit. The true church resides in the hearts of all believers which is ruled by the Spirit of God-the Holy Spirit. All believers assemble themselves together in the local church to worship and praise God in love. We are to praise Him for who He is and what He has done and continues to do in the lives of mankind and especially believers.
There should be no dissension among God's people just as there is no dissension in the Godhead as each member of the Godhead operates coequally in the lives of mankind. The Godhead operates in love and unity; therefore, Christians are encouraged to do likewise.
Christ is the head of the church and in the lives of all believers, which makes all believers knitted together in love. Therefore, comfort your hearts and let love rule, because Christ's love conquered all.
Isn't love a wonderful thing? It provided salvation when nothing else could. Love! Love and then love some more.