There is no perfect knowledge which can be entitled ours, that is innate; none but what has been obtained from experience, or derived in some way from our senses.

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

As art is a habit with reference to things to be done, so is science a habit in respect to things to be known.

There is no perfect knowledge which can be entitled ours, that is innate; none but what has been obtained from experience, or derived in some way from our senses.

I avow myself the partisan of truth alone.

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.

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