v11 & 12
These things have I spoken unto you, that my joy might remain in you, and [that] your joy might be full.
This is my commandment, That ye love one another, as I have loved you.
I want to have joy, and to have it in full-- And I know people who want that. Don't you? Right after talking about that, the Lord says that we ought to love each other as He has loved us.
Let's love each other with that same greatest kind of love that led the Lord to lay down His life for us.