Piper quote "It is because

of the ambivalent structure of philosophy, because "marveling" sets one on a road that never ends, because the structure of philosophy is that of hope, that to philosophize is so essentially human - and in a sense to philosophize means living a truly human life.

-Josef Piper, Leisure: The Basis of Culture, pg. 125.

http://www.pc.maricopa.edu/ss/phi101/I/IA_Leisure_Basis.htm

Liberty Fund link for Leisure

Buy from an independent bookstore: http://www.indiebound.org/book/9780865972100

Buy from Ignatius which published the edition I have..

Josef Pieper (1904–1997) was an influential German Catholic philosopher, scholar, and author.

Thanks to Iram for recommending this book.