Small rooms or dwellings discipline the mind, large ones weaken it.
Nature is full of infinite causes that have never occurred in experience.
There are three classes of people: those who see, those who see when they are shown, those who do not see.
Whoever in debate quotes authority uses not intellect, but memory.
The eye transmits its own image through the air to all the objects which face it, and also receives them on its own surface, whence the "sensus communis" takes them and considers them.
We know more about the movement of celestial bodies than about the soil underfoot.