Black is like a broken vessel, which is deprived of the capacity to contain anything.

Mechanics is the paradise of the mathematical sciences because by means of it one comes to the fruits of mathematics.

Just as eating against one's will is injurious to health, so studying without a liking for it spoils the memory, and it retains nothing it takes in.

True and great love springs out of great knowledge, and where you know little you can love but little or not at all.

The smallest feline is a masterpiece.

There is no higher or lower knowledge, but one only, flowing out of experimentation.

The variety of colour in objects cannot be discerned at a great distance, excepting in those parts which are directly lighted up by the solar rays.