'I don’t want to alarm you, but if there is something you have thought about doing, whether you thought you should do it or that you might like to do it or that maybe it wouldn’t hurt to do it, if it involved moving through space across a vast distance or even a relatively short distance but one that lay outside the walls of your house, if it involved speaking to, touching or spending any length of time with someone, or touching with a bare hand something that another person may have touched, also with a bare hand, or else breathed on, or sitting in relatively close proximity to other persons while indoors and maybe even eating something while you sat in those crowded surrounds, or being in the vicinity of persons who demonstrate a clear preference for speaking in raised voices or, god forbid, shouting, then probably it would be sensible to defer that desire for now.' (Introduction)