John 14-6 is the cornerstone text to point sinners in the way to the Fahter.

Westminister Confession of Faith Chapter 13 on Sanctification

The Apostles were imprisoned and threatened with death for their preaching. why-

We are warned of Judas, Satan and Peter in this chapter.

Adoption

Ananias and Sapphira stand as warnings to never fake our worship or service for God. Even a lie God takes very seriously.

The Lord set the disciples an example of humility when he washed their feet. He calls upon us to follow His example.

Why Faith Alone, while James says that true faith is never alone.

Threatened but not defeated, the early Christians went to prayer for power to preach despite the threats.

In this section of John's gospel we come to the end of Jesus' public ministry to the Jewish people, His own people. -There is some debate on the closing verses of chapter 12, whether they are a separate day of ministry or a summary of the three years of the Lord's ministry.-I am inclined to think that verses 44 - 50 are a separate day and the final day of public ministry for the Lord.