Water and oil both represent wisdom. Water represents the wisdom of life in this world, a wisdom that flows from the tallest mountain to the lowest valley, from the highest cloud to the deepest ocean floor. In all things, that wisdom breathes, telling us how to live, how to bring harmony into this world. Oil represents a wisdom that is beyond this world. It is called the hidden wisdom because it is hidden by its very nature, so that it must be squeezed out of its source with great effort. But if it is a wisdom that is beyond this world, why make the effort...