FHG,
Can I 'reason the spiritual things with logic'? Yep! I need logic to understand the language I speak and to read what you have written here and to read the Scripture. God has invented logic so that we can understand each other when we speak or write. I'm blessed to know that God created logic so that we can communicate with each other and that He can communicate with us.
Now to John 14:26. Its context is John 14:22-29,
You want John 14:26 (NLT) to mean what it does not mean in context. Jesus told his disciples information while he was still with them on earth, but he was going away and the disciples would need reminding what Jesus told them. Obviously they didn't have a perfect memory of all that he had told them. For that purpose, the Holy Spirit (the Advocate, Paraclete) would remind them what Jesus had told them. The Advocate would not be giving them new revelation through teaching (your language is 'that is why we need the Holy Spirit to teach us, John 14:26'). Not so!
Jesus was addressing Judas (not Iscariot) and the other disciples. He was instructing them about what would happen when he left them. He was not giving information for Christians down to the 21st century to follow. This has caused leading evangelical commentator, D A Carson, to write about John 14:26 (NIV):
In context, John 14:26 (NLT) is teaching something quite different to what you want to promote. Careful exposition of the text is necessary, rather than cherry picking a verse to make a point that is not in the text in context.
As for John 3:12, Jesus was speaking to a respected Jewish leader, Nicodemus, who did not know the Lord. He needed his spiritual eyes to be opened. This verse is not telling information that you want it to mean. Again, cherry picking a verse aborts the meaning you are pushing.
As for John 3:1-6 (NLT) and Nicodemus, the issue had nothing to do with dumbing down 'logical reasoning' (your language). Nicodemus, a Pharisee, knew Jesus, the Teacher, was sent from God 'to teach us', but he needed his eyes opened regarding being born again (John 3:3 NLT). Then Jesus revealed the truth to Nicodemus of the need to be born of water and the Spirit (John 3:5-6 NLT). This was an issue of proclamation of the Gospel (even though prior to Jesus' death and resurrection). These 6 verses are not teaching antagonism to logical reasoning. They are teaching content - the need to be born again to enter God's kingdom.
If you try these kinds of cherry picking exercises again, I'll not reply as you have demonstrated here that you cherry pick verses to make them say what they do not mean in context.
Oz
Works consulted
Carson, D A 1991. The Gospel According to John. Leicester, England: Inter-Varsity Press / Grand Rapids, Michigan: William B. Eerdmans Publishing Company.