Unity is the state of being one.  God is three persons and yet he is one [1 Jn 5:7].  

Unity is a thing undivided in itself, but separate from every other thing.  Ps 122:3, “Jerusalem is builded as a city that is compact together.”  When Jesus returns, Jerusalem will be undivided, and there will be no other city in the world like it because the Lord will be there [Ezek 48:35].  

In Eph 2:19-22, the household of God is “fitly framed together.”  In Eph 4:16, the body of Christ is “fitly joined together and compacted.”  1 Cor 12:12, “For as the body is one, and hath many members, and all the members of that one body, being many, are one body: so also is Christ.”  Therefore, in Eph 4:4-6, there is “one body, and one Spirit, even as ye are called in one hope of your calling; One Lord, one faith, one baptism, One God and Father of all.”  The body of Christ is absolutely unique in that we are to be one and yet separate from unbelievers, unrighteousness, darkness, Belial, infidels and idols [2 Cor 6:14-18].

Ps 133:1 says that it is good for brethren to dwell together in unity; it is pleasant for brethren to dwell together in unity.  So, we must strive for unity.  To dwell together in unity we must be:

Bound together by the Spirit – Eph 4:3 – when we were saved, we were all baptized into the body of Christ by the Spirit of God.  We are in him.  But not everybody in him is in unity with each other.  To be in unity with each other we need to live by Eph 4:2 and 4:3, endeavoring to keep the unity of the Spirit in the bond of peace.  The devil will attack that unity through other spirits.  Those of us who believe we are united by the Spirit in this local church need to have grace with those in the body who don’t agree with us.  The Holy Spirit is doing remarkable work in the lives of other people who don’t see things the way you and I do.  But for us to be in unity with each other, we must endeavor to keep the unity of the Spirit in the bond of peace.

Bound together by faith – Eph 4:13 – till we all come in the unity of the faith… one day we will all believe the same doctrine.  Phil 2:2-3 in the meantime we must work at being likeminded, having the same love, being of one accord, of one mind.  Those of us who believe the KJV need to have grace with others who haven’t learned what you know to be true.  Those who follow the light they have been given are still being led by the Spirit.  You can see the errors and the weakness in their faith, but have grace with them.  For us, it is essential that we be likeminded.  We teach and preach doctrine in Sunday school and church, making sure the we are all on the same page with the Lord.  When our faith is based on sound doctrine, our minds will be alike.

Bound together by charity – Col 3:14 – 1 Cor 13:13, 16:14 – charity is essential to the unity of the people in church.  1 Pet 4:8 we aren’t perfect, so charity assists us in getting along in spite of our faults and sins.  Charity is the glue in the body that keeps us fitly framed together.  Consider the charity between two loving people in marriage.

Conclusion: the Lord desires unity.  It is good and it is pleasant.  He wants to see unity in his people.  If we will yield to his Spirit, believe and obey the same words, and have charity with each other, we will stick together and be good and pleasant to the Lord.