Context matters as to who is speaking, who is being spoken to and what is being said.
In the context of Jn 15:16 Jesus is speaking to His Apostles about choosing them to be Apostles. He promises those Apostles the Comforter (v26) "he shall teach you (Apostles) all things, and bring all things to your remembrance, whatsoever I have said unto you" (Jn 14:26) meaning the APostles were inspired by the Holy Spirit in what they spake and wrote which no one today has this inspiration. Your argument fails on Jn 15:16 for you keep taking it out of context adding ideas to it that are not there. God is not a respecter of persons (Acts 10:34-35) in unconditionally chooisng some to be saved leaving others to be lost.
Let's run through your post from the end toward the beginning, but here's some of our conversation background first.
Lord Jesus says "
you" to all believers in all time during the supper recorded in John chapters 14 - 17, and this Truth (John 14:6) is absolute with "
you did not choose Me, but I chose you" (Lord Jesus Christ, John 15:16) and "
I chose you out of the world" (Lord Jesus Christ, John 15:19, includes salvation) and "
What I say to you I say to all" (Lord Jesus Christ, Mark 13:37 - Jesus had taken the Apostles Peter, Andrew, James, and John aside in private and said this).
Your thoughts that Jesus exclusively uses "
you" as a reference to "the office of an apostle" during the supper shows your failure of spiritual understanding.
Near the end of your post you brought up Acts 10:34-35, so let's look at Peter's words:
So Peter opened his mouth and said: “Truly I understand that God shows no partiality, but in every nation anyone who fears him and does what is right is acceptable to him."
You break the context here just like you adulterate John 15:16 into that which it is not - your "
you of the office of an Apostle did not choose Me, but I chose you for the office of an Apostle only" (word of Ernest T. Bass).
Peter's context is God does not show partiality to the Jews by omitting the Gentiles. Your context is that God distinguishes no difference between one person and another person - instead of nations. It is written "though the twins were not yet born and had not done anything good or bad, so that God’s purpose according to His choice would stand, not because of works but because of Him who calls, it was said to her, 'The older will serve the younger.' Just as it is written, 'Jacob I loved, but Esau I hated'" (Romans 9:11-13).
Now, let's go back to where you brought up John 14:26. This is one of several passages during the supper recorded in John chapters 14 - 17 where Jesus promises the Holy Spirit while using "
you" - not your adulterated "
he shall teach you (Apostles) all things, and bring all things to your remembrance, whatsoever I have said unto you " (see your heart's addition of "Apostles"). Here is the unadulterated Word of God:
the Helper, the Holy Spirit, whom the Father will send in My name, He will teach you all things, and bring to your remembrance all that I said to you (John 14:26)
LORD JESUS' PROMISE OF THE HOLY SPIRIT AND FULFILLING
In John chapter 14, John chapter 15, and John chapter 16 Jesus explicitly promises the Holy Spirit. For example, He said "
I will ask the Father, and He will give you another Helper, that He may be with you forever; that is the Spirit of truth, whom the world cannot receive, because it does not see Him or know Him, but you know Him because He abides with you and will be in you" (John 14:16-17).
When the Holy Spirit came upon the disciples of Jesus at Pentecost, there were about 120 persons present according to the next two sets of passages:
"Then they returned to Jerusalem from the mount called Olivet, which is near Jerusalem, a Sabbath day's journey away. When they had entered the city, they went up to the upper room where they were staying; that is, Peter and John and James and Andrew, Philip and Thomas, Bartholomew and Matthew, James the son of Alphaeus, and Simon the Zealot, and Judas the son of James. These all with one mind were continually devoting themselves to prayer, along with the women, and Mary the mother of Jesus, and with His brothers. At this time Peter stood up in the midst of the brethren (a gathering of about one hundred and twenty persons was there together), and said" (Acts 1:12-15)
"When the day of Pentecost had come, they were all together in one place. And suddenly there came from heaven a noise like a violent rushing wind, and it filled the whole house where they were sitting. And there appeared to them tongues as of fire distributing themselves, and they rested on each one of them. And they were all filled with the Holy Spirit and began to speak with other tongues, as the Spirit was giving them utterance." (Acts 2:1-4)
One hundred twenty people is more than eleven Apostles; therefore, the Lord Jesus was talking to all His disciples of all time when Jesus said "
you" with reference to the indwelling Holy Spirit (John 14:16-17) and He said "
you" with reference to God's exclusive ability to choose men and men's inability to choose God (John 15:16) as recorded by the Apostle John.
CRUCIAL POINT: The Holy Spirit, The Apostle Peter, The Gentiles Cornelius And All His Household, And Lord Jesus Saying "You"
Cornelius is of crucial import to this topic for among the places that we find fulfillment of the Word of God's promise of the Holy Spirit is when Gentiles at Cornelius' place were filled with the Holy Spirit (Acts 10:44).
At a time after the outpouring of the Holy Spirit during Pentecost (Acts 2:1-4), Peter recounted to the apostles and brethren about the Gentiles Cornelius with his relatives and his close friends, and the account Peter shared of the Gentiles receiving the Holy Spirit with being saved illuminated that not just Jews would be saved but also Gentiles would be saved (Acts 11:1-18).
At that time, Peter said to the apostles and brethren "And I remembered the word of the Lord, how He used to say, '"
John baptized with water, but you will be baptized with the Holy Spirit' " (Acts 11:16).
Prior to the time of the outpouring of the Holy Spirit during Pentecost (Acts 2:1-4), Lord Jesus said ""
John baptized with water, but in a few days you will be baptized with the Holy Spirit" (Acts 1:5) to the apostles whom Jesus gathered togather (Acts 1:4) which included Peter, and Jesus says "
you" right here - with the apostles present right there, Jesus says "
you".
Later after the outpouring of the Holy Spirit during Pentecost (Acts 2:1-4), Peter remembered Lord Jesus saying "
you will be baptized with the Holy Spirit" and there is the word "
you" (Acts 11:16) which Peter tied to the Gentiles Cornelius with all his household (Acts 11:14); furthermore, Peter tied when Lord Jesus says "
you" to all believers in all time (Acts 11:17)!
Thus, the fulfillment of the Word of God's promise of the Holy Spirit is more than the Apostles in John chapters 14-16, and includes not just the Jews but also the Gentiles because of Cornelius, and our Lord Jesus saying "you" to the disciples includes all disciples in all time.
THE SUPPER IN JOHN CHAPTERS 13 TO 17
Both the promise of the Holy Spirit (John 14:16-17, John 14:26, John 15:26-27, John 16:7-14) as well as God's exclusive role in choosing man (John 15:16, John 15:19) occur in the self-same supper recorded in John chapters 13 - 17, so the "
you" in John 15:16 is all believers in all time.
Peter [said] to them, "Repent, and each of you be baptized in the name of Jesus Christ for the forgiveness of your sins; and you will receive the gift of the Holy Spirit. For the promise is for you and your children and for all who are far off, as many as the Lord our God will call to Himself." (Acts 2:38-39).
See that "the promise is for you and your children and for all who are far off (Acts 2:39), so Peter is in accord with Jesus using "
you" to include all believers in all time with:
- "you did not choose Me, but I chose you" (Lord Jesus Christ, John 15:16), so God chooses people to be friends (John 15:15 , the prior verse) and to believe (John 6:29) and to be born again (John 3:3-8) and for righteous works (John 3:21, John 15:5) and to repent (Matthew 11:25) and to love (John 13:34) and unto salvation (John 15:19 the same passage).
- "I chose you out of the world" (Lord Jesus Christ, John 15:19, includes salvation), so God chooses people unto salvation.
- "What I say to you I say to all" (Lord Jesus Christ, Mark 13:37 - Jesus had taken the Apostles Peter, Andrew, James, and John aside in private and said this), so all the blessings of God mentioned above are to all believers in all time.