The fact is that the work which improves the condition of mankind, the work which extends knowledge and increases power and enriches literature and elevates thought, is not done to secure a living. It is not the work of slaves driven to their tasks either by the task, by the taskmaster, or by animal necessity. It is the work of men who somehow find a form of work that brings a security for its own sake and a state of society where want is abolished.
— Henry George, Progress and Poverty, 1879
Quoted by Martin Luther King, Jr., “Where Do We Go From Here?” 1967
h/t to Grégoire