What about them walls

1 Corinthians 12:12 (NLT)
12 The human body has many parts, but the many parts make up one whole body. So it is with the body of Christ.

Different backgrounds but one

1 Corinthians 12:13 (NLT)
13 Some of us are Jews, some are Gentiles, some are slaves, and some are free. But we have all been baptized into one body by one Spirit, and we all share the same Spirit.

“The leveling influence of Christian doctrine, with its rejection of distinctions between master and slave, served as a significant force in shaping the development of Western egalitarian thought, which later contributed to social and political movements for equality.”
The Protestant Ethic and the Spirit of Capitalism – Max Weber 

1 Corinthians 12:13 (NLT)
13 Some of us are Jews, some are Gentiles, some are slaves, and some are free. But we have all been baptized into one body by one Spirit, and we all share the same Spirit. 

What holds us together?

1. We have been baptized into one by one Spirit
2. We all the same Spirit.

Galatians 3:26–29 
For you are all children of God through faith in Christ Jesus. And all who have been united with Christ in baptism have put on Christ, like putting on new clothes. There is no longer Jew or Gentile, slave or free, male and female. For you are all one in Christ Jesus. And now that you belong to Christ, you are the true children of Abraham. You are his heirs, and God’s promise to Abraham belongs to you.

Different parts but one

1 Corinthians 12:18–26 (NIV):
But in fact God has placed the parts in the body, every one of them, just as he wanted them to be. If they were all one part, where would the body be? As it is, there are many parts, but one body.

The eye cannot say to the hand, “I don’t need you!” And the head cannot say to the feet, “I don’t need you!” On the contrary, those parts of the body that seem to be weaker are indispensable, and the parts that we think are less honorable we treat with special honor. And the parts that are unpresentable are treated with special modesty, while our presentable parts need no special treatment. But God has put the body together, giving greater honor to the parts that lacked it, so that there should be no division in the body, but that its parts should have equal concern for each other. If one part suffers, every part suffers with it; if one part is honored, every part rejoices with it.

Galatians 2:20 (NLT):
20 My old self has been crucified with Christ. It is no longer I who live, but Christ lives in me. So I live in this earthly body by trusting in the Son of God, who loved me and gave himself for me