Can you reword this paragraph please? "In The Alchemist, the spiritual unity represented by the Soul of the World binds together all of nature, from human beings to desert sand. This idea underlies the parallel we see in the novel between the alchemist purifying metal into gold and Santiago purifying himself into someone capable of achieving his Personal Legend. According to the novel, the Soul of the World has created an ultimate desire, or Personal Legend, for everything, whether Santiago or a piece of iron. To accomplish its Personal Legend, each thing must learn to tap into the Soul of the World, which purifies it. That continual purification ultimately leads to perfection. This notion of humans, metals, and all other things sharing the same goal demonstrates that all elements in nature are essentially different forms of a single spirit."