At the same time, he became interested in literature and became an habitué of the Café Gijón, where he met many prominent writers of his generation, including Ignacio Aldecoa, Rafael Sánchez Ferlosio, and Juan Benet.
He also participated in the so-called "Academia Errante," a debate forum created by restless Spanish intellectuals in the sixties who were searching for new forms of expression.
In 1955, he wrote a thesis entitled Dilthey, Jaspers y la comprensión del enfermo mental (Dilthey, Jaspers, and Understanding the Mentally Ill), followed in 1964 by Libertad, temporalidad y transferencia en el psicoanálisis existencial (Freedom, Temporality, and Transference in Existential Psychoanalysis).
He became a member of the Partido Socialista Obrero Español (PSOE), a clandestine organization, and was thrown into prison on three occasions.
That same year, he began writing Tiempo de destrucción (Time of Destruction), but it was left incomplete when he died in a traffic accident in Vitoria, Spain on 21 January 1964.