About your question about the Holy Spirit.... Check this out:
In John 6:46, Jesus Christ said this (Scriptures from "The Literal Translation of the Holy Bible"/LITV):
" not that anyone has seen the Father, except the One being from God, He has seen the Father."
But, then in Matthew 18:10, Jesus Christ said this:
"See that you do not despise one of these little ones, for I tell you that their angels in Heaven continually look on the face of My Father in Heaven."
In the Bible, it is extremely important to look at the context and understand what Jesus is truly saying. In John 6:46, Jesus said that ONLY HE had seen The Father, and He did not mention the fact that the angels also see The Father in Heaven. The reason for this is because in John 6:46 Jesus is making the point that no HUMAN on earth has ever seen The Father except for Jesus, so He did not need to bring the angels into his discussion. Jesus was not discussing the angels in John 6:46.
So, just because Jesus uses the word "Only" in a certain context does not always mean that Jesus was saying "Only" in the absolute sense.
Matthew 24:36: "But of that day and hour no one knows, not even the angels of heaven, neither the Son, but the Father only".
When He said that, Jesus had not yet spoken to His Apostles about the coming of the Holy Spirit (John Chapters 14-16), and so they may not have known much about Him yet. Notice this Scripture:
John 7:39 (LITV): But He said this concerning the Spirit, whom the ones believing into Him were about to receive; for the Holy Spirit was not yet given, because Jesus was not yet glorified.
The Spirit had not yet been given to the Apostles in the fullest way. Jesus probably did not want to confuse His disciples any more than necessary by mentioning a THIRD Person in Matthew 24:36 that He had not yet told them much about.
Jesus did not want to bring the Holy Spirit, a Person whom the Apostles hardly knew anything about at this point, into the picture until He could explain to them about who this Spirit is (John Chapters 14-16).
Also, in the New Testament, nearly always, whenever it mentions an attribute or title of One of the Persons of the Trinity, it is true of ALL 3 Persons.
For example: The New Testament says Jesus is our ONLY Lord (Jude 1:4, Ephesians 4:5, 1 Corinthians 8:6), but it also says that The Father is our Lord (Matthew 11:25, Luke 10:21, Acts 4:29, Revelation 11:15). The New Testament also says that The Holy Spirit is Lord (2 Corinthians 3:13).
The New Testament says Jesus Christ is the Only Judge (John 5:22, Romans 14:10-12), but it also says that God is the Judge (1 Corinthians 5:13, Hebrews 12:23, Hebrews 13:4).
The New Testament says that The Father is "The Only True God" (John 17:3), but it also says that Jesus is God (John 20:28, John 1:1, Romans 9:5, 1 John 5:20).
The New Testament says that God is the One who "knows the hearts" of people (Acts 1:24), but it also says that Jesus is the One who knows the hearts (Revelation 2:23).
So, when the New Testament makes a statement that One of the Three Persons of the Trinity is the "Only" One who has a certain quality or attribute, it does NOT exclude the other Two Persons from also having that quality or attribute.
In fact, the New Testament, in 1 Corinthians 2:10-11, DOES say that the Holy Spirit knows EVERYTHING that God The Father knows:
1 Corinthians 2:10-11 (LITV): But God revealed them to us by His Spirit, for the Spirit searches all things, even the depths of God. For who among men knows the things of a man, except the spirit of a man within him? So also no one has known the things of God except the Spirit of God.
You could ask the Jehovah's Witnesses why 1 Corinthians 2:11 says that ONLY The Holy Spirit knows what God is thinking. Why did that Verse not say that Jesus knows what God is thinking?