In a video that was mainly just the usual dribble and diatribe about "spiritual materialism" and "mystical dangers" etc., there was one line that actually did hit home with me: The question, what are you really looking for in your meditation, yoga, tantra, etc.? Are you looking for awareness? Are you looking for entertainment? For power?
Of course, to this teacher, it was clear that, out of these, awareness is the only valid option; and I don's see things like that at all. If it is power you seek, that's your call, it's just never been one of my own primary goals.
However, I do endorse knowing what you're doing, and I think that it is a good idea to answer this very question, not once or twice, but every once in a while, with regard to your favourite "spiritual" practice.