↑Cicero, Marcus Tullius (1877). Tusculan Disputations. New York: Harper & Brothers. p. 166. From whence all who occupied themselves in the contemplation of nature were both considered and called wise men; and that name of theirs continued to the age of Pythagoras, who is reported to have gone to Phlius, as we find it stated by Heraclides Ponticus, a very learned man, and a pupil of Plato, and to have discoursed very learnedly and copiously on certain subjects with Leon, prince of the Phliasii; and when Leon, admiring his ingenuity and eloquence, asked him what art he particularly professed, his answer was, that he was acquainted with no art, but that he was a philosopher. Leon, surprised at the novelty of the name, inquired what he meant by the name of philosopher, and in what philosophers differed from other men; on which Pythagoras replied, “That the life of man seemed to him to resemble those games which were celebrated with the 166greatest possible variety of sports and the general concourse of all Greece. For as in those games there were some persons whose object was glory and the honor of a crown, to be attained by the performance of bodily exercises, so others were led thither by the gain of buying and selling, and mere views of profit; but there was likewise one class of persons, and they were by far the best, whose aim was neither applause nor profit, but who came merely as spectators through curiosity, to observe what was done, and to see in what manner things were carried on there. And thus, said he, we come from another life and nature unto this one, just as men come out of some other city, to some much frequented mart; some being slaves to glory, others to money; and there are some few who, taking no account of anything else, earnestly look into the nature of things; and these men call themselves studious of wisdom, that is, philosophers: and as there it is the most reputable occupation of all to be a looker-on without making any acquisition, so in life, the contemplating things, and acquainting one’s self with them, greatly exceeds every other pursuit of life.”
↑Cameron, Alister (1938). The Pythagorean Background of the theory of Recollection. George Banta Publishing Company.
↑Jaeger, W. 'On the Origin and Cycle of the Philosophic Ideal of Life.' First published in Sitzungsberichte der preussischen Akademie der Wissenschaften, philosophisch-historishce Klasse, 1928; Eng. Translation in Jaeger's Aristotle, 2nd Ed. Oxford, 1948, 426-61
↑Guthrie, W. K. C. (1962–1981). A history of Greek philosophy. Cambridge: Cambridge University Press. pp. 165–166. ISBN978-0-521-05160-6. OCLC22488892. This does not of course amount to saying that the simile goes back to Pythagoras himself, but only that the Greek ideal of philosophia and theoria (for which we may compare Herodotus's attribution of these activities to Solon I, 30) was at a fairly early date annexed by the Pythagoreans for their master
↑Quinton, Anthony. 1995. "The Ethics of Philosophical Practice." P. 666 in The Oxford Companion to Philosophy, edited by T. Honderich. New York: Oxford University Press. ISBN978-0-19-866132-0.
"Philosophy is rationally critical thinking, of a more or less systematic kind about the general nature of the world (metaphysics or theory of existence), the justification of belief (epistemology or theory of knowledge), and the conduct of life (ethics or theory of value). Each of the three elements in this list has a non-philosophical counterpart, from which it is distinguished by its explicitly rational and critical way of proceeding and by its systematic nature. Everyone has some general conception of the nature of the world in which they live and of their place in it. Metaphysics replaces the unargued assumptions embodied in such a conception with a rational and organized body of beliefs about the world as a whole. Everyone has occasion to doubt and question beliefs, their own or those of others, with more or less success and without any theory of what they are doing. Epistemology seeks by argument to make explicit the rules of correct belief formation. Everyone governs their conduct by directing it to desired or valued ends. Ethics, or moral philosophy, in its most inclusive sense, seeks to articulate, in rationally systematic form, the rules or principles involved." (p. 666).