Many things are better for silence than for speech: others are better for speech than for stationery.

Progress, the religion of those who have none.

The passion for power over others can never cease to threaten mankind, and is always sure of finding new and unforseen allies in continuing its martyrology.

If the past has been an obstacle and a burden, knowledge of the past is the safest and the surest emancipation.

Authority that does not exist for Liberty is not authority but force.

Every error pronounces judgment on itself when it attempts to apply its rules to the standard of truth.

There are two things which cannot be attacked in front: ignorance and narrow-mindedness. They can only be shaken by the simple development of the contrary qualities. They will not bear discussion.