The best road to correct reasoning is by physical science; the way to trace effects to causes is through physical science; the only corrective, therefore, of superstition is physical science.

The knowledge of one generation is the ignorance of the next.

How are men to be secured in any rights without instruction; how to be secured in the equal exercise of those rights without equality of instruction? By instruction understand me to mean knowledge - just knowledge; not talent, not genius, not inventive mental powers.

The sciences have ever been the surest guides to virtue.

Truth is but approved facts.

Instead of establishing facts, we have to overthrow errors; instead of ascertaining what is, we have to chase from our imaginations what is not.

Do we exert our own liberties without injury to others - we exert them justly; do we exert them at the expense of others - unjustly. And, in thus doing, we step from the sure platform of liberty upon the uncertain threshold of tyranny.