Classicly

If we had the means of investigating historically the origin of Secret Societies, we should probably find that they began to be formed almost as soon as any knowledge had been accumulated by particular individuals beyond what constituted the common stock. The same thing has happened to knowledge that has happened to all other human possessions,—its actual holders have striven to keep it to themselves.

It is true that in this case the possessor of the advantage does not seem to have the same reason for being averse to share it with others which naturally operates in regard to many good things of a different kind; he does not, by imparting it to those around him, diminish his own store