Any New Testament book that is not John. Luke, Mark or Matthew are not the words of Christ.
They are the words and opinions of Paul. Paul never met Jesus and was dead-set against James who did receive the word of Christ directly.
So personally, I only read the 4 books mentioned above.
It would be helpful if you would select some passages which have strongly influenced your spiritual growth as I am most interested in what Jesus said; rather than the doctrinal precepts that define Christianity