“Leisure, the highest happiness upon earth, is seldom enjoyed with perfect satisfaction, except in solitude. Indolence and indifference do not always afford leisure; for true leisure is frequently found in that interval of relaxation which divides a painful duty from an agreeable recreation; a toilsome business from the more agreeable occupations of literature and philosophy.”
![“[In science any model depends on a pre-chosen taxonomy] a set of classifications into which we divide the enormous complexity of the real world... Land, labor, and capital are extremely heterogeneous aggregates, not much better than earth, air, fire, and water.” quote by Kenneth E. Boulding](https://sms4smile.com/quotes/img-quotes/47e/kenneth-e-boulding-3728_air_in-science-any-model-depends-on-a-pre-ch_12383.jpg)
