Desire is a weaker or primitive stage of the wish. When an idea, a thought, is not yet made clear in one's own mind and one's own mind has not taken a decision: "It must be so, I would like it to be so" - then it is a desire, it is a fancy. It comes and it goes, and one does not care. But when that desire is a little more developed then it is a wish. Then it stays there, it does not fade away like clouds, it is tangible, it is there. Yet it is not fulfilled, because for fulfillment it must develop.