Introduction
  Remind of setting (MAP) and Paul’s passion to help them/us  toward spiritual maturity (1:28). Remind  of the two main aspects of this path: increasing our understanding and  appreciation of what we have received through Christ (3:1-4), and embracing a  lifestyle of love that is consistent with God’s love for us (3:5-17). This lifestyle has three foci (LIST). We look today at the second focus.
  Read 3:12-16. You can  see by the usage of “one another” and “each other” (3:13,16) that Paul is  referring to Christians relating to other Christians. In this case, “put on love” is connected to  “unity” between Christians (3:14).  Likewise, “the peace of God” (3:15) is here a synonym for unity between  Christians, not psychological peace within Christians. Paul is teaching that embracing a lifestyle  of love involves building unity with other Christians. Let’s ask the same three questions that we  asked last week about thankfulness: What is this unity? Why is it so important? How can we cultivate it?
What is it?
  The New Testament speaks of different kinds of unity between  Christians, so it’s important to understand which kind of unity is in view  here.
  
    There is collaboration unity between churches – as when different Christian churches collaborate functionally  on a project. Paul called the Gentile  churches he had planted to collaborate in giving money to help their Jewish  brethren in Jerusalem (cf.1Cor.16; 2Cor.8,9). Our church collaborates with many other  churches and ministries on many different projects (EXAMPLES). But this kind of unity is not in view here –  Paul makes no reference to it.
    There is also organizational unity within a local church – the formation and maintenance of leadership  structures and other church policies that enable the church to function in an orderly way. Paul reminds Timothy of the  need for organizational unity in his letters to him  (cf.1Tim.3,5). Our  church has developed these structures and policies over the years, and they are  very important. But this kind of unity  is not in view here – Paul makes no reference to it, either.
    The unity in view here is personal,  relational unity between Christians in the same local church – the development  of the local church into a network of Christ-centered friendships. This kind of unity is what the New Testament  speaks about most often, and it is the foundational unity that enables the  other two kinds of unity to develop and flourish. One of the futile projects of the  contemporary western church is relying on organizational unity or collaboration  unity to accomplish its mission, instead of giving primary attention to  relational unity.
  
Why is it so important?
  Why does God make such a big deal of this kind of  unity? Why does every single New  Testament letter emphasize this, while only a few talk about the other kinds of  unity?
  
    Because effective  evangelism is impossible without it (read Jn.13:34,35). Notice that Jesus doesn’t call this “one of  many options;” He calls it His mandate to us.  What does it take to convince people that Jesus is a living Person whose  leadership can change their lives (“you are – not were – My disciples”)? Of course, we need to tell them this and give  them reasons why we know this is true.  But this telling must be  accompanied by observable love between Christians – the same kind of love that  Jesus showed the disciples – if it is to be persuasive. Just as the lyrics of a song often get our  attention only after the melody has drawn us in, so the message of Christianity  often gets people’s attention only after this loving unity has aroused our  curiosity and interest.
    
      “God's plan is that local bodies of believing  Christians... (become) a dynamic community in which (evangelism)  becomes intensely productive. The church  that convinces people that there is a God is a church that manifests what only  a God can do, that is, to unite human beings in  love...There is nothing that convinces people that God  exists or that awakens their craving for Him like the discovery of Christian  brothers and sisters who love one another...The sight  of loving unity among Christians arrests the non-Christian. It crashes through his intellect, stirs up  his conscience and creates a tumult of longing in his heart because he was  created to enjoy the very thing that you are demonstrating.”  For how many of you did this play a key role in  your conversion? (75% - 80% is what I  have noticed)
      The numerical decline of true Christians in America is a  well-documented fact. Devout Christians  rightly lament this fact, and promote many projects, seminars, crusades, etc.  in the hope of arresting this decline. Some  of these efforts are very good, some are not so good, and some are  counter-productive. But even the best of  these efforts will never turn the tide. We  will never be able to out-market, out-entertain, or out-argue our culture. We have the message of God’s grace and we  have real loving unity – and that’s it!  This is why the lack of loving unity in American churches is mandatory  for the harvest of souls that God desires.
    
    Because spiritual  maturity is impossible without it. Remember  that spiritual maturity is increasing in Christ-like character (name fruits of  the Spirit). What context is necessary  for character development in children?  Would we expect to see this in children who live 24-hour day-care  centers? Or would we expect to see this  in children who lived in families?  Character requires nurture, modeling, personalized instruction, loving  discipline, appropriate responsibilities, supervision, etc. – and this is what  only a family context can provide.
    
      Some of us have had the good fortune of growing up in healthy  families. Most of us did not have this  opportunity – and our characters are under-developed as a result. But thank God that He has provided us with a  new family in which we can develop Christ-like character (read 1  Thess.2:7,11,12)! That family is  called “the local church,” and that healthy, character-developing family life  is called “unity.” But if the local  church is to develop maturing members, each of us members has to make the building of unity one of our highest priorities! That  is exactly what Paul is calling for in this passage! He describes two key ways to build unity...
    
  
How to build it
  By helping one other be  filled with the Word of Christ. Read  3:16. We covered this verse several  weeks ago when we studied 1:28,29 – so I will just review it briefly. “The Word of Christ” refers especially to  “the things above” – all that God has freely given us through Christ  (EXAMPLES). It also refers to rejecting  a self-centered way of life and embracing a lifestyle of love. We are not to live on a subsistence intake of  the Word of Christ. God wants it to  “richly dwell within us” – to be so at home in us that it increasingly  dominates our thinking and our decisions – because this is what unleashes the  Holy Spirit to transform our lives. 
  
    The point here is that we cannot be filled by the Word of  Christ in isolation. No amount of  private reading and study can take the place of regularly sharing Christ’s Word  with other Christians – teaching (reading, explaining, reminding) one another,  admonishing (counseling, warning, correcting) one another, and praying out loud  (especially thanking) with one another one another.
    This kind of interaction is different from large meetings like  this one, which is not conducive to doing these things with one another. This involves initiating and maintaining a  network of Christ-centered friendships. This  is best facilitated by being in a home group: home group meeting discussion  & prayer & before/after interaction; cell groups; discipleship; prayer  meetings, etc.
    This is a super-important way of building unity. What step in this direction is God putting  before you? Is it to investigate a home  group? Is it to commit to a home  group? Is it to ask someone in your home  group about getting together to do this?  God always gives us a (scary, but) doable step in this direction! If you are doing this, it will lead you into  the second way to build unity...
  
  By persevering with one  another despite our messiness and sinfulness. Read 3:12,13.  Paul is totally realistic here in his description of Christian  unity. We are really broken people, we have  really messy lives, and we have lots of sin.  For this reason, we need to commit ourselves to one another for the long  haul, and we need to love each other in ways that don’t come naturally to us. 
  
    We need to express compassion for one another person’s suffering,  rather than be cold and insensitive. We need  to express kindness (positively blessing the other person), rather than being passive  or demanding. We need gentleness (strength  under control to help), rather than run over one another with the truth. We need patience (literally “long-suffering”),  rather than “moving on” when things get difficult. We need to bear with one another, rather than  to withdraw because we’re fed up with one another’s idiosyncrasies and  besetting sins. We need to forgive one  another when we get sinned against, instead of paying back or rejecting. Undergirding all this, we need humility (a  servant attitude), rather than being boastful or self-absorbed or demanding our  rights or “I didn’t sign up for this!.” 
    How can we do this?  Where does the motivation for this kind of commitment come from? It comes from remembering and focusing on the  fact that this is the way we have been loved by God (3:12a,13b)! 
    
      3:13b – Even though I deserved God’s judgment, He forgave me at  the cost of His own Son’s death. On that  same basis, God continues to forgive me and bear with all of my weird  idiosyncrasies and besetting sins. In  view of this, how can I not extend forgiveness and forbearance to my Christian  friends?
      3:12a – While I was still rebelling against God, He humbly took  the initiative toward me, He set me apart as His Child, and He continues to  pour out His love on me. In view of  this, how can I not extend compassion and kindness and gentleness and patience  to my Christian friends?
      The key to building unity in this way, then, is not how messy  your Christian friends’ lives get, or how badly they treat you. It is whether you let their messiness and/or  sins deepen your appreciation of God’s love for you in spite of your messiness  and sin!
    
  
  This is a super-important way of building unity. What Christian friend is God asking you to  hang in there with? What expression of  persevering love is He asking you to express to them? How is He asking you to appreciate how He  loves you in this same way?
Conclusion
NEXT WEEK: We’re going to take a one-week break from our series  to study a remarkable Old Testament book: Jonah
DISCUSSION: Let’s have some questions and/or comments about the  above two ways to build unity.
  John  White, The Fight (Downers Grove:  InterVarsity Press, 1979), pp. 149,150.