We all know the meaning of this phrase in our everyday life. The Spirit is that which gives life and movement to anything, in fact it is that which causes it to exist at all. The thought of the author, the impression of the painter, the feeling of the musician, is that without which their works could never have come into being, and so it is only as we enter into the IDEA which gives rise to the work, that we can derive all the enjoyment and benefit from it which it is able to bestow.