But I tell you the truth, it is for your benefit that I am going away. Unless I go away, the Advocate will not come to you; but if I go, I will send Him to you.
Jesus says his going is for their benefit because the Advocate will come only after he leaves.
His departure makes room for the Spirit.
5Now, however, I am going to Him who sent Me; yet none of you asks Me, ‘Where are You going?’ 6Instead, your hearts are filled with sorrow because I have told you these things. 7But I tell you the truth, it is for your benefit that I am going away. Unless I go away, the Advocate will not come to you; but if I go, I will send Him to you. 8And when He comes, He will convict the world in regard to sin and righteousness and judgment: 9in regard to sin, because they do not believe in Me; 10in regard to righteousness, because I am going to the Father and you will no longer see Me; 11and in regard to judgment, because the prince of this world has been condemned. 12I still have much to tell you, but you cannot yet bear to hear it. 13However, when the Spirit of truth comes, He will guide you into all truth. For He will not speak on His own, but He will speak what He hears, and He will declare to you what is to come. 14He will glorify Me by taking from what is Mine and disclosing it to you. 15Everything that belongs to the Father is Mine. That is why I said that the Spirit will take from what is Mine and disclose it to you. 16In a little while you will see Me no more, and then after a little while you will see Me. ”