In the search for truth - that everything in nature seems to hide - man needs the assistance of all his faculties. All the senses should be awake.

A fact never went into partnership with a miracle. Truth scorns the assistance of wonders. A fact will fit every other fact in the universe, and that is how you can tell whether it is or is not a fact. A lie will not fit anything except another lie.

In the presence of death I affirm and reaffirm the truth of all that I have said against the superstitions of the world. I would say that much on the subject with my last breath.

The whip degrades; a severe father teaches his children to dissemble; their love is pretense, and their obedience a species of self-defense. Fear is the father of lies.

Anger is a wind which blows out the lamp of the mind.

The falling leaf that tells of autumn's death is, in a subtler sense, a prophecy of spring.

Courage without conscience is a wild beast.