Ancient Roman patricians were proud of being able to enjoy "ocio", similar to leisure in English. It set them apart from plebeians engaged in "negocio", the negation of ocio – now the Spanish word for business. Interestingly “ocio”, in a round-about way, is the root of “school” in English, as the place where lectures are given. One aspect of ocio can be learning for the sake of learning.
Illich is mainly remembered for his writings on education, transportation, and medicine, but he also wrote about how modern society faces the challenges of growing population, limited resources, increasing concentration of wealth, governments' ever expanding control over our lives, gender issues, and the rights of indigenous peoples. In each case Illich's point of view was very different from the mainstream.