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 Clive Sarnak is a South African-born mathematician with dual South-African and American nationalities. He has been Eugene Higgins Professor of Mathematics at Princeton University since 2002, succeeding Andrew Wiles, and is an editor of the Annals of Mathematics.