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

To make a perfume, take some rose water and wash your hands in it, then take a lavender flower and rub it with your palms, and you will achieve the desired effect

O sleepers! what a thing is slumber! Sleep resembles death. Ah, why then dost thou not work in such wise as that after death thou mayst retain a resemblance to perfect life, when, during life, thou art in sleep so like to the hapless dead?

Anyone who conducts an argument by appealing to authority is not using his intelligence; he is just using his memory.

Music... is the shaping of the invisible.

I say that the power of vision extends through the visual rays to the surface of non-transparent bodies, while the power possessed by these bodies extends to the power of vision.

I have wasted my hours.