2 John 1:9

Anyone who runs on ahead and does not remain in the doctrine of Christ (that is, one who is not content with what He taught), does not have God: but the one who continues to remain in the teaching (of Christ does have God), he has both the Father and the Son.

The standard for all we hear is the Bible and our safeguard from false teaching. If someone is trying to teach something opposite or out of line with the Bible, we should not listen. We don’t want to pollute our faith or cause doubts to come with a word that isn’t scriptural. That is why knowing and reading the word is so important.