To me this is one of those odd quirks of human thought - the more you try not to think about something, the more it forces itself into your mind. In the end, all we can do is face up to it and deal with the thought itself. At the same time, it could also be that we had nothing to fear in the first place, but rather to enjoy. This poem could apply to so many things - it has a universal quality which all poets should aspire to :)