Freedom is the freedom of the spirit and it is mere illusion to search for it exclusively in the natural world. For the order of freedom and the order of nature are opposed to one another, and the deepest thinkers have always been aware of the difference between them. Nature is always a deterministic system, and our own nature therefore cannot be the source of our freedom […] Freedom must be discovered and revealed in the experience of the spiritual life. (Freedom and the Spirit)
