To practice means to perform, in the face of all obstacles some act of vision, of faith, of desire. Practice is a means of inviting the perfection desired.
Bio: Peter van Nieuwenhuizen is a Dutch physicist. He is now a distinguished Professor at Stony Brook University in the United States. Van Nieuwenhuizen is best known for his discovery of supergravity with Sergio Ferrara and Daniel Z. Freedman.