Scientists are fully occupied creating more and more subtle categories, which, it appears to them, describe nature with increasing accuracy. At the same time their thinking is also becoming more abstract, if purely in an attempt to avoid being swallowed up by the complexity of their own categories. Yet no matter how detailed or abstract scientists become, no matter how reductionistic or holistic, they will be infinitely far from reality, and doomed to go in circles, until they learn what categories are.
Children can help us here. Their categories are extremely simple, enabling them to see things that are invisible to adults. This does not mean we should become children! Of course, children do not have the penetrating vision of the abstract adult mind. However, children can help us become aware of what we have lost, and can yet refind.
The true man of spirit has the direct vision of the child in addition to the power of abstraction. He is not ruled by categories; he creates, masters, and uses them, all in the knowledge they are neither real nor illusory. He sees his own categories without categorising them.