the mode of delivering a truth makes, for the most part, as much impression on the mind of the listener as the truth itself.

The world is full of religion, and full of misery and crime.

Knowledge signifies things known. Where there are no things known, there is no knowledge. Where there are no things to be known, there can be no knowledge. We have observed that every science, that is, every branch of knowledge, is compounded of certain facts, of which our sensations furnish the evidence. Where no such evidence is supplied, we are without data; we are without first premises; and when, without these, we attempt to build up a science, we do as those who raise edifices without foundations. And what do such builders construct? Castles in the air.

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

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.

These will vary in every human being; but knowledge is the same for every mind, and every mind may and ought to be trained to receive it.

the leading error of the human mind, - the bane of human happiness - the perverter of human virtue ... is Religion - that dark coinage of trembling ignorance! It is Religion - that poisoner of human felicity! It is Religion - that blind guide of human reason! It is Religion - that dethroner of human virtue! which lies at the root of all the evil and all the misery that pervade the world!