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

It is no small benefit on finding oneself in bed in the dark to go over again in the imagination the main lines of the forms previously studied, or other noteworthy things conceived by ingenious speculation.

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

One has no right to love or hate anything if one has not acquired a thorough knowledge of its nature. Great love springs from great knowledge of the beloved object, and if you know it but little you will be able to love it only a little or not at all.

There is no result in nature without a cause; understand the cause and you will have no need of the experiment.

The five senses are the ministers of the soul.

The lover is moved by the thing loved, as the sense is by that which perceives, and it unites with it and they become one and the same thing... when the lover is united with the beloved it finds rest there; when the burden is laid down there it finds rest.