
Early on a difficult climb, especially a difficult solo climb, you constantly feel the abyss pulling at your back.
Eiger Dreams: Ventures Among Men and Mountains - Página 177 http://books.google.com.br/books?id=1rbQvvxaIeQC&pg=PA177, Jon Krakauer - Globe Pequot, 2009, ISBN 1599216108, 9781599216102, 188 páginas