What does Jesus mean in John 16:7-11?

Nevertheless I tell you the truth; It is expedient for you that I go away: for if I go not away, the Comforter will not come unto you; but if I depart, I will send him unto you.    And when he is come, he will reprove the world of sin, and of righteousness, and of judgment:    Of sin, because they believe not on me;    Of righteousness, because I go to my Father, and ye see me no more;    Of judgment, because the prince of this world is judged.   

John 16:7-11

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