Beware of the words "internal security," for they are the eternal cry of the oppressor.

I never approved either the errors of his book, or the trivial truths he so vigorously laid down. I have, however, stoutly taken his side when absurd men have condemned him for these same truths.

All sects are different, because they come from men; morality is everywhere the same, because it comes from God.

Our wretched species is so made that those who walk on the well-trodden path always throw stones at those who are showing a new road.

We have our arts, the ancients had theirs... We cannot raise obelisks a hundred feet high in a single piece, but our meridians are more exact.

Once the people begin to reason, all is lost

Every one goes astray, but the least imprudent are they who repent the soonest.