Persecution for opinion is the master vice of society.

Moral truth, resting entirely upon the ascertained consequences of actions, supposes a process of observation and reasoning.

the language of truth is too simple for inexperienced ears.

I never walked through the streets of any city with as much satisfaction as those of Philadelphia. The neatness and cleanliness of all animate and inanimate things, houses, pavements, and citizens, is not to be surpassed.

The sciences have ever been the surest guides to virtue.

it is not that religion is merely useless, it is mischievous. It is mischievous by its idle terrors; it is mischievous by its false morality; it is mischievous by its hypocrisy; by its fanaticism; by its dogmatism; by its threats; by its hopes; by its promises.

Opinions are not to be learned by rote, like the letters of an alphabet, or the words of a dictionary. They are conclusions to be formed, and formed by each individual in the sacred and free citadel of the mind, and there enshrined beyond the arm of law to reach, or force to shake; ay! and beyond the right of impertinent curiosity to violate, or presumptuous arrogance to threaten.