There is a context to consider with regard to this document. It contains evidence of the conflict concerning eternal life going on at the time, and which lies behind its contents. This is pretty obvious from page 4. In it the author presents his side of the argument; and without such an awareness, the statements it contains and their relevance might seem rather obscure.
This is an example of where there is the need to carry out research properly, with both sides of the argument carefully weighed, and, importantly, in the light of an open Bible.