Science does not know its debt to imagination.

The vanishing, volatile froth of the present which any shadow will alter, any thought blow away, any event annihilate, is every moment converted into the adamantine.

If we suddenly plant our foot, and say, - I will neither eat nor drink nor wear nor touch any food or fabric which I do not know to be innocent, or deal with any person whose whole manner of life is not clear and rational, we shall stand still. Whose is so? Not mine; not thine; not his. But I think we must clear ourselves each one by the interrogation, whether we have earned our bread to-day by the hearty contribution of our energies to the common benefit? and we must not cease to tend to the correction of these flagrant wrongs, by laying one stone aright every day.

The years teach much which the days never know.

Every great man is a unique. The Scipionism of Scipio is precisely that part he could not borrow.

There is the illusion of time, which is very deep; who has disposed of it? Mor come to the conviction that what seems the succession of thought is only the distribution of wholes into causal series.

The efforts which we make to escape from our destiny only serve to lead us into it.