The desire to enjoy is the matter of creation and it is divided into 4 levels: the still, vegetative, animate, and man. The more the desire to enjoy grows, the more power of thought it requires in order to be optimally filled. We can study creatures that are on a lower level than we are with our mind, but we find it difficult to study ourselves since in order to learn who I am, I have to rise to a level that is higher than me, to the level of Godliness, and I can do that by using the wisdom of Kabbalah.