Discussion is an exchange of knowledge; argument an exchange of ignorance.
Robert Quillen
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Knowledge is not happiness, and science
But an exchange of ignorance for that
Which is another kind of ignorance.Lord Byron
The exchange of one fear or pleasure or pain for another fear or pleasure or pain, which are measured like coins, the greater with the less, is not the exchange of virtue. O, my dear Simmias, is there not one true coin, for which all things ought to exchange?--and that is wisdom; and only in exchange for this, and in company with this, is anything truly bought or sold, whether courage or temperance or justice. ...in the true exchange, there is a purging away of all these things, and temperance, and justice, and courage, and wisdom herself are a purgation of them.
Socrates
Fairness means not to use fraud and trickery in the exchange of commodities and services and the exchange of feelings.
Erich Fromm
All exchange stimulates productive activity, whether exchange by gift, gambling, barter, or money transaction.
Aaron C. Brown
Exchange value forms the substance of money, and exchange value is wealth.
Karl Marx
Quillen, Robert
Quiller-Couch, Sir Arthur
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