I am curious what people's views are on the concepts of 'yin qi' and 'yang qi', and what the sources are for your views on such things. For example, do you think that there are two distinct forms of qi, one of which is pure yin and one of which is pure yang, or do you think that such expressions are really just indicating the relative characteristics or qualities of certain forms of qi, such as Earth qi is more yin as compared to Heaven qi, and Heaven qi is more yang as compared to Earth qi, etc., or do you think the concept of there being such things as 'yin qi' and 'yang qi' is just plain wrong? Also, I would be interested in hearing what people are basing their views on. Is this something you have been taught from a certain tradition or teacher, or how did you come to your view? I have never been a big question asker when I have interacted with teachers, so I have never asked any of my teachers over the years specifically about this.