The mark of highest originality lies in the ability to develop a familiar idea so fruitfully that it would seem no one else would ever have discovered so much to be hidden in it. – Goethe

We should scarcely desire things ardently if we were perfectly acquainted with what we desire. – Francois de La Rochefoucauld

A writer who wishes to be read by posterity must not be averse to putting hints which might give rise to whole books, or ideas for learned discussions, in some corner of a chapter so that one should think he can afford to throw them away by the thousand. – Georg Christoph Lichtenberg