Che Guevara
In Guevara's private writings from this time (since released), he displays his growing criticism of the Soviet political economy, believing that the Soviets had "forgotten Marx". This led Guevara to denounce a range of Soviet practices including what he saw as their attempt to "air-brush the inherent violence of class struggle integral to the transition from capitalism to socialism", their "dangerous" policy of peaceful co-existence with the United States, their failure to push for a "change in consciousness" towards the idea of work, and their attempt to "liberalize" the socialist economy. Guevara wanted the complete elimination of money, interest, commodity production, the market economy, and "mercantile relationships": all conditions that the Soviets argued would only disappear when world communism was achieved. Disagreeing with this incrementalist approach, Guevara criticized the "Soviet Manual of Political Economy", correctly predicting that if USSR did not abolish the law of value (as Guevara desired), it would eventually return to capitalism.
Che Guevara
As he grew older, he developed an interest in the Latin American writers Horacio Quiroga, Ciro Alegría, Jorge Icaza, Rubén Darío and Miguel Asturias. Many of these authors' ideas he cataloged in his own handwritten notebooks of concepts, definitions, and philosophies of influential intellectuals. These included composing analytical sketches of Buddha and Aristotle, along with examining Bertrand Russell on love and patriotism, Jack London on society and Nietzsche on the idea of death. Sigmund Freud's ideas fascinated him as he quoted him on a variety of topics from dreams and libido to narcissism and the Oedipus complex. His favorite subjects in school included philosophy, mathematics, engineering, political science, sociology, history and archaeology.