To love is to take delight in happiness of another, or, what amounts to the same thing, it is to account another's happiness as one's own.

Virtue is the habit of acting according to wisdom.

There are also two kinds of truths: truth of reasoning and truths of fact.

We should like Nature to go no further; we should like it to be finite, like our mind; but this is to ignore the greatness and majesty of the Author of things.

I am convinced that the unwritten knowledge scattered among men of different callings surpasses in quantity and in importance anything we find in books, and that the greater part of our wealth has yet to be recorded.

The art of discovering the causes of phenomena, or true hypotheses, is like the art of deciphering, in which an ingenious conjecture often greatly shortens the road.

Reality cannot be found except in One single source, because of the interconnection of all things with one another.