The human tendency to regard little things as important has produced very many great things.

Imagine the world so greatly magnified that particles of light look like twenty-four-pound cannon balls.

The thoughts written on the walls of madhouses by their inmates might be worth publicizing.

With prophecies the commentator is often a more important man than the prophet.

How might letters be most efficiently copied so that the blind might read them with their fingers?

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.

Never undertake anything for which you wouldn't have the courage to ask the blessings of heaven.