At this point, of course, my thoughts went to One Cosmos Under God (another fairly easy read), where Robert Godwin uses the phrase "mind parasites" to describe the unhelpful complexes that plague our species. Given that Rabbi Steinsaltz considers the human being a line or ray that stretches all the way from the Holy One to the material plane and beyond, or that humans are said to be in the image of God, it makes perfect sense to have parasitic entities swarming us. This is not a purely religious observation: The very fact that we have creativity and imagination is what makes it possible for us to also play host to all kinds of weirdness.
(* Steinsaltz believes that approaching holy places or times without proper preparation, or at the very least proper attitude, may be worse than nothing. The New Testament expresses a similar view in regards to the Eucharist, to the point where indifference to its spiritual nature may even be life-threatening. In light of this we may surmise that Jesus' warning to not give dogs what is holy is also an expression of concern for the dogs. On the Internet, nobody can see that you are a dog, so take care.)