 As a consequence of his writings Marías was briefly imprisoned and, upon his release, banned from teaching.Fortunately for Marías the proceeds from the sales of his "History of Philosophy", which went through countless editions, meant that the punishment did not seriously damage his livelihood.In 1948 he co-founded, along with his former teacher José Ortega y Gasset, the Instituto de Humanidades (which he went on to head after the death of Ortega in 1955).