It is not man that will ever lead you and guide you into all truth and understanding. It is the Holy Spirit, the Spirit of Truth.
You have have one teacher...Messiah

That is very true Michael.

My concern for that is we must test the Spirit against something. There has to be a common rule or measure that can be used. If we do not have such, we would easily be misled, thinking it be the Ruach Ha'Kodesh where is in fact it was a misleading spirit.

So if we have a teacher, that is the Ruach send by Yeshua that will teach us, that spirit should then affirm what we learn in the council of many where there is wisdom. Is it not so?

I'm trying to understand then how the mentioned passages which is on superficial level contradictory, complimentary to each other.

I see your answer about the abounding of the law. Am I then missing something in translation or tradition? For the two seems very opposite. One says eye for an eye and life for life, but Yeshua use the word 'but I tell you', as if he is saying something different.