It is pure illusion to think that an opinion which passes down from century to century, from generation to generation, may not be entirely false.

It is thus tolerance that is the source of peace, and intolerance that is the source of disorder and squabbling.

I lay down the Position, That whatever a Conscience well directed allows us to do for the Advancement of Truth, an erroneous Conscience will warrant for advancing a suppos'd Truth.

I know too much to be a sceptic and too little to be a dogmatist.

The antiquity and general acceptance of an opinion is not assurance of its truth.

In matters of religion, it is very easy to deceive a man and very hard to undeceive him.

It has been asserted, that a moral Atheist would be a monster beyond the power of nature to create: I reply, that it is not more strange for an Atheist to live virtuously, than for a Christian to abandon himself to crime! If we believe the last kind of monster, why dispute the existence of the first?