We think of desire as a spiritually undesirable state of mind. Because it holds such power over our actions and thoughts, we are reluctant to thoroughly take it on and explore what it is. Desire is not just one simple state of mind. It is the composition of all the links that preceded it in Dependent Origination, the confluence of ignorance, mental formations, consciousness, name and form, six sense base, contact, and feelings. It holds all of that and the idea of "me" as well. As an analogy, think of snow as being the composite of temperature, humidity, atmospheric pressure, etc. Snow seems like something separate and different from the conditions that form it, but it is those conditions. We can enter and examine the energy of desire through any of these composite conditions. Encouraged by our thoughts, desire also has a strong sense of becoming something, something essential to us. But when we look at desire, it is a future thought holding the wish of a different life. Sad, is it not? When properly seen, we can you feel the grief of the unfulfilled desire?