In the field of ideas not involving productive activities it is easier to distinguish the division between material and spiritual necessity. For a long time man has been trying to free himself from alienation through culture and art. While he dies every day during the eight or more hours that he sells his labour, he comes to life afterwards in his spiritual activities.
But this remedy bears the germs of the same sickness; it is as a solitary individual that he seeks communion with his environment.

Man and Socialism in Cuba (1965)