Do churches exist for the benefit of homogeneous social units? No, God was reconciling the world to himself and churches must reflect the grand scope of his purpose.
Ezekiel saw the river of life flowing from the presence of God, growing deeper as it went. The river of life flows still into the world, and will flow on for ever.
Paul puts the needs of the Corinthians before his own. Why should he care so much about people with whom he has naturally so little in common? The love of Christ constrains him.
Believers are called to a life of constant worship. But according to Ezekiel, there are particular times when worship is particularly appropriate.
Those who wanted to undermine Paul could always find a reason to do so. On the one side, they called him insane, on the other a rationalist.