Henceforth I call you not servants; for the servant knoweth not what his lord doeth: but I have called you friends; for all things that I have heard of my Father I have made known unto you. Henceforth I call you not servants - Which he at least indirectly had done, John 13:16; Matthew 10:24, Matthew 10:25; Luke 17:10.
I have called you friends - I have admitted you into a state of the most intimate fellowship with myself; and have made known unto you whatsoever I have heard from the Father, which, in your present circumstances, it was necessary for you to be instructed in.