The school book seems to have been written by Mario Rodríguez Cobos alias Silo.
He was an Argentine thinker, writer and philosopher born on January 6, 1938 in Mendoza, Argentina, known for having developed, among other things, a philosophical and spiritual approach called "Universal Humanism". Died on September 16, 2010,

Note: the comments contained in “The School Book” are of course those of the author alone.