A man may live long, and die at last in ignorance of many truths, which his mind was capable of knowing, and that with certainty.

[I]t being reasonable and just, I should have a right to destroy that which threatens me with destruction: for by the fundamental law of nature, man being to be preserved as much as possible, when all cannot be preserved, the safety of the innocent is to be preferred: and one may destroy a man who makes war upon him, or has discovered an enmity to his being, for the same reason that he may kill a Wolf or a lion.

Any single man must judge for himself whether circumstances warrant obedience or resistance to the commands of the civil magistrate; we are all qualified, entitled, and morally obliged to evaluate the conduct of our rulers. This political judgment, moreover, is not simply or primarily a right, but like self-preservation, a duty to God. As such it is a judgment that men cannot part with according to the God of Nature. It is the first and foremost of our inalienable rights without which we can preserve no other.

Long discourses, and philosophical readings, at best, amaze and confound, but do not instruct children. When I say, therefore, that they must be treated as rational creatures, I mean that you must make them sensible, by the mildness of your carriage, and in the composure even in the correction of them, that what you do is reasonable in you, and useful and necessary for them; and that it is not out of caprichio, passion or fancy, that you command or forbid them any thing.

I pretend not to teach, but to inquire.

Firmness or stiffness of the mind is not from adherence to truth, but submission to prejudice.

It is ambition enough to be employed as an under-labourer in clearing the ground a little, and removing some of the rubbish that lies in the way to knowledge.