If nature has made any one thing less susceptible than all others of
exclusive property, it is the action of the thinking power called an idea,
which an individual may exclusively possess as long as he keeps it to
himself;
But the moment it is divulged, it forces itself into the possession of
everyone, and the receiver cannot dispossess himself of it. He who
receives an idea from me, receives instruction himself without lessening
mine; as he who lights his taper at mine, receives light without darkening
me. That ideas should freely spread from one to another over the globe,
for the moral and mutual instruction of man, and improvement of his
condition, seems to have been peculiarly and benevolently designed by
nature, when she made them, like fire, expansible over all space, without
lessening their density at any point, and like the air in which we breath
and move, and have our physical being, incapable of confinement or
exclusive appropriation. Inventions then cannot, in nature, be a subject
of property.
[Thomas Jefferson, To George Wythe, "Crusade Against
Ignorance" in
_Thomas Jefferson on Education_, ed. Gordon C. Lee. 1961. New York:
Teachers College Press, pp. 99-100.]
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