Reassurance and Warning, Reflection on John 16:12-15

Jesus tells his followers that he is going and the Advocate is coming. This Spirit will guide the followers into all truth, will declare to them the things that are to come. We read this message as comfort--to them and to us, the continuation of the church.

I'm grateful to Fred Craddock for pointing out the implicit concern contained within this warning:

This text has been used to bless every fad and notion, but the fear of the new and different must not cause the church to abandon the promise.
When the church becomes protective and defensive, ... preachers become curators. The Spirit continually presses the question, What is the meaning of Jesus Christ today?
....
The apostolic and biblical witness remains as a canon for testing the spirits, for the Holy Spirit does not speak apart from or contrary to the historical Jesus....

If you want to read more, see Preaching through the Christian Year B.