A circumstance which has always appeared wonderful to me, is that such sublime discoveries should have been made by the sole assistance of a quadrant and a little arithmetic.

What will the preachers say? .. to teach men not to persecute men: for, while a few sanctimonious humbugs are burning a few fanatics, the earth opens and swallows up all alike.

Anyone who has the power to make you believe absurdities has the power to make you commit injustices.

When he who hears does not know what he who speaks means, and when he who speaks does not know what he himself means, that is philosophy.

As long as people believe in absurdities they will continue to commit atrocities.

Feeble verses are those which sin not against rules, but against genius.

He must be very ignorant for he answers every question he is asked.