Memory cannot exist without endurance of the things perceived, and the thing perceived cannot remain where it has never been.

Nature is a volume of which God is the author.

Civilization is only a series of victories against nature.

I have often wondered and even laughed at those who fancied that everything had been so consummately and absolutely investigated by an Aristotle or a Galen or some other mighty name, that nothing could by any possibility be added to their knowledge.

It is, however, an argument of no weight to say that natural bodies are first generated or compounded out of those things into which they are at the last broken down or dissolved.

Very many maintain that all we know is still infinitely less than all that still remains unknown.

Memory cannot exist without endurance of the things perceived, and the thing perceived cannot remain where it has never been.