Jesus did not say "I as the Holy Ghost stand at the door and knock" He said, "I stand at the door and knock."
16 And I will pray the Father, and he shall give you another Comforter, that he may abide with you for ever;
The context is the sending of the Holy Spirit to abide in the believer for ever.
17 Even the Spirit of truth; whom the world cannot receive, because it seeth him not, neither knoweth him: but ye know him; for he dwelleth with you, and shall be in you.
Again context is the Holy Spirit indwelling where the believer becomes the temple of God.
18 I will not leave you comfortless, I will come to you.
Jesus is alluding here that he is the COMFORTER and he reveals that it is him who will come to dwell in the believer as the Holy Ghost.
19 Yet a little while, and the world seeth me no more; but ye see me: because I live, ye shall live also.
Here Jesus is revealing to his disciples that in a little while when he ascends into Heaven the world at large will no longer see me.
However he says he will not leave his disciples comfortless because he will come to them on Pentecost to be seen by his disciples because he will live in them as the Holy Ghost.
20 At that day ye shall know that I am in my Father, and ye in me, and I in you.
That day being Pentecost in context to the Holy Ghost being given to live in the believer, so in that respect the glorified Christ is one with the Father who is the Holy Ghost, full filling the
you in me and I in you. This statement is in context to the believer
SUPPING with the Lord's Holy Ghost.
21 He that hath my commandments, and keepeth them, he it is that loveth me: and he that loveth me shall be loved of my Father, and I will love him, and will manifest myself to him.
Here confirms the saying of the glorified Christ, that I stand at the door and knock and if anyone opens the door of their heart, I will reveal/manifest myself to him by SUPPING with him as the Holy Ghost. This is in context to the Holy Ghost indwelling of the believer.
22 Judas saith unto him, not Iscariot, Lord, how is it that thou wilt manifest thyself unto us, and not unto the world?
Very good question?
How can you manifest yourself onto us and yet at the same time the world will never see you?
Christ manifests himself as the Holy Ghost who indwells the believer.
But let us listen to what Christ Jesus says.
23 Jesus answered and said unto him, If a man love me, he will keep my words: and my Father will love him, and we will come unto him, and make our abode with him.
I see thankyou Jesus, so you will come onto the believer and abode/dwell in your Holy Temple that the believer represents. So given the context of the sending of the Holy Ghost at Pentecost, it is the glorified Christ who indwells us as the Father who is Holy Spirit (John 4:24).
24 He that loveth me not keepeth not my sayings: and the word which ye hear is not mine, but the Father's which sent me.
So who are they that do not keep your saying Lord Christ Jesus.
25 These things have I spoken unto you, being yet present with you.
(KJV)
Oh see so you are saying these things as the Word because you are present with the disciples before your ascension. So when you come in the Spirit as the COMFORTER you are the Holy Father who indwells us.