Socrates’ method was to clear his students’ minds of abstractions and assumptions, so that they might attain self-knowledge and learn the practical wisdom of living well. His pupil Plato, however, ...

Diogenes of Sinope, a beggar who lived on the streets of Athens in the fourth century B.C.E., has been hailed as the progenitor of performance art, an inspiration for the Occupy movement, and, by the ...