Here are a couple of resources pertaining to Sunday’s sermon from John 17:20-26 on Christian unity.

What Is Christian Unity? — An article by John Piper

Some questions for reflection:

1. Of the many things that Jesus could pray for his followers in John 17, why do you think he made it a point to pray that “they may all be one”? 
2. Some might that a focus on Christian unity would distract from reaching those who don’t know Christ as Savior. How does the end of 17:21 say that Christian unity benefits those outside the Christian faith?
3. What is the correlation between Jesus prayer for oneness, and his command in John 13:34-35?
4. How could you personally help to maintain and promote Christian unity?

Charles Spurgeon: “Where the Spirit of God is there must be love, and if I have once known and recognized any man to be my brother in Christ Jesus, the love of Christ constraineth me no more to think of him as a stranger or foreigner, but a fellow citizen with the saints.”

A prayer and reflection for Christian unity from the apostle Paul in Romans 15:5-7– May the God of endurance and encouragement grant you to live insuch harmony with one another, in accord with Christ Jesus, that together youmay with one voice glorify ^bthe God and Father of our Lord Jesus Christ. Therefore welcome one another as Christ has welcomed you, for the glory of God.