Desire that comes from within a person who is called "Yisrael" to be similar to the nations of the world. It is our fundamental nature. Yisrael are those who desire the Creator. So out of this desire for the Creator, there is also a desire downwards, for our original nature, which is the will to receive...
We understand that, our structure, which consists of a body and a soul. In the body we are no different than any other creature, having the same living body as any animal or beast, with the same processes occurring in us. Our desires are a little greater and hence our brain a bit more evolved, but all in all it is a result of the evolution of man in this world...