Reason must be our last judge and guide in everything.

To love truth for truth's sake is the principal part of human perfection in this world, and the seed-plot of all other virtues.

Consciousness is the perception of what passes in man's own mind.

As usurpation is the exercise of power which another has a right to, so tyranny is the exercise of power beyond right, which nobody can have a right to.

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.

Those are not at all to be tolerated who deny the being of God. Promises, covenants, and oaths, which are the bonds of human society, can have no hold upon an atheist. The taking away of God, though but even in thought, dissolves all.

Men in great fortunes are strangers to themselves, and while they are in the puzzle of business, they have no time to tend their health either of body or mind.