There is a story which gives a picture of this idea. A man who had heard of there being a tree of desire was once travelling; and he happened to find himself under the shade of a tree, which he felt to be restful and cooling, so he sat there leaning against it. He said to himself, "How beautiful is nature; how cooling is the shade of this tree, and the breeze is most exhilarating; but I wish I had a soft carpet to sit on, and some cushions to lean against." No sooner had he thought about it than he saw himself sitting in the midst of soft cushions.