Charles Spurgeon Commentary John 14:17-20

"[even] the Spirit of truth: whom the world cannot receive; for it beholdeth him not, neither knoweth him: ye know him; for he abideth with you, and shall be in you. I will not leave you desolate: I come unto you. Yet a little while, and the world beholdeth me no more; but ye behold me: because I live, ye shall live also. In that day ye shall know that I am in my Father, and ye in me, and I in you." — John 14:17-20 (ASV)

For he dwells with you, and shall be in you. I will not leave you comfortless: I will come to you. Yet a little while, and the world sees me no more; but you see me: because I live, you shall live also.

At that day you shall know that I am in my Father, and you in me, and I in you.

These are the three wonderful mysteries of the union between God, and Christ, and his people: "I am in my Father, and you in me, and I in you."