This is, without a doubt, one of G. K. Chesterton's most representative books and probably his best essay. A kind of spiritual and wandering autobiography that completes what was started in his book Herejes, from 1905 (Acantilado, 2007). Optimistic and polemical, an insightful tour de force towards a philosophy of grateful wonder and mental and emotional freedom, this book is already an indisputable classic.