This small volume of six essays on cosmological and philosophical topics by Ernesto Cardenal shows us a new facet of the poet and mystic. In these texts, he lets us understand the philosophical and astrophysical considerations that have become the basis of a large part of his poetry. We get to know the mystic as a researcher who discursively engages with scientific theories and the philosophy of Socrates, Heraclitus and Lao-Tse and turns them into stone sources for his particular theological and poetic work.