Let not men think there is no truth, but in the sciences that they study, or the books that they read.

I doubt not, but from self-evident Propositions, by necessary Consequences, as incontestable as those in Mathematics, the measures of right and wrong might be made out.

Every man must some time or other be trusted to himself.

The Church which taught men not to keep faith with heretics, had no claim to toleration.

Children should from the beginning be bred up in an abhorrence of killing or tormenting any living creature; and be taught not to spoil or destroy any thing, unless it be for the preservation or advantage of some other that is nobler.

If you punish him for what he sees you practise yourself, he... will be apt to interpret it the peevishness and arbitrary imperiousness of a father, who, without any ground for it, would deny his son the liberty and pleasure he takes himself.

The Indians , whom we call barbarous, observe much more decency and civility in their discourses and conversation, giving one another a fair silent hearing till they have quite done; and then answering them calmly, and without noise or passion. And if it be not so in this civiliz'd part of the world, we must impute it to a neglect in education, which has not yet reform'd this antient piece of barbarity amongst us.