Those who know the true use of money, and regulate the measure of wealth according to their needs, live contented with few things.

I make this chief distinction between religion and superstition, that the latter is founded on ignorance, the former on knowledge.

The greatest good is the knowledge of the union which the mind has with the whole nature.

Happiness is not the reward of virtue, but is virtue itself; nor do we delight in happiness because we restrain from our lusts; but on the contrary, because we delight in it, therefore we are able to restrain them.

We can always get along better by reason and love of truth than by worry of conscience and remorse...we should strive to keep worry from our life.

The order and connection of ideas is the same as the order and connection of things.

Nothing comes to pass in nature, which can be set down to a flaw therein; for nature is always the same, and everywhere one and the same in her efficacy and power of action: that is, nature's laws and ordinances, whereby all things come to pass and change from one form to another, are everywhere and always the same; so that there should be one and the same method of understanding the nature of all things whatsoever, namely, through nature's universal laws and rules.