I avow myself the partisan of truth alone.

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

For the concept of a circuit of the blood does not destroy, but rather advances traditional medicine.

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

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

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.

The heart is the household divinity which, discharging its function, nourishes, cherishes, quickens the whole body, and is indeed the foundation of life, the source of all action.