All of us deal with some kind of deep-seated fear. It helps to keep that in mind when reading Isaiah 7, for it concerns a king with deep-seated, and legitimate fear.
Gnostics claimed there was no such thing as sin, therefore it was impossible to sin, for it did not exist. There was no point in seeking not to sin, because there was no such thing as “sin” or “sinning” in the first place. John strongly contested such thinking.