As a man develops, he places a greater value upon his own rights. Liberty becomes a grander and diviner thing. As he values his own rights he begins to value the rights of others. And when all men give to all others all the rights they claim for themselves, this world will be civilized.

When passions and appetites are stronger than the intellect, men are savages; when the intellect governs the passions, when the passions are servants, men are civilized. The people need education - facts - philosophy.

Crimes were committed to punish crimes, and crimes were committed to prevent crimes. The world has been filled with prisons and dungeons, with chains and whips, with crosses and gibbets, with thumbscrews and racks, with hangmen and heads-men — and yet these frightful means and instrumentalities have committed far more crimes than they have prevented.... Ignorance, filth, and poverty are the missionaries of crime. As long as dishonorable success outranks honest effort — as long as society bows and cringes before the great thieves, there will be little ones enough to fill the jails.

It has always seemed absurd to suppose that a god would choose for his companions, during all eternity, the dear souls whose highest and only ambition is to obey.

In all ages the people have honored those who dishonored them. They have worshiped their destroyers; they have canonized the most gigantic liars, and buried the great thieves in marble and gold. Under the loftiest monuments sleeps the dust of murder.

Reason, observation, and experience; the holy trinity of science.

Fear is religion, courage is science.