How do you relate the Bible and the Valentinian writings in the Nag Hammadi Scriptures?
First, what authority do the Valentinian writings have?
Second, what authority does the Bible have?
Third, how do the Nag Hammadi Scriptures and the Bible relate to one another?
These are difficult questions and little consensus among Gnostic Christians. But more importantly, this has to be answered before we can even talk about beliefs.
Unfortunately, there is a lot of ungrounded talk under the banner of Gnosticism. Most talk past one another. Everything strange and weird is found under the banner of Gnosticism. That is why these three questions have to be answered for the conversation can even begin.