Let proportion be found not only in numbers and measures, but also in sounds, weights, times, and positions, and what ever force there is.

Learning acquired in youth arrests the evil of old age; and if you understand that old age has wisdom for its food, you will so conduct yourself in youth that your old age will not lack for nourishment.

All our knowledge hast its origins in our perceptions … In nature there is no effect without a cause … Experience never errs; it is only your judgments that err by promising themselves effects such as are not caused by your experiments … Science is the observation of things possible, whether present or past; prescience is the knowledge of things which may come to pass.

I have wasted my hours.

Medicine is the restoration of discordant elements.

Of the original phenomena, light is the most enthralling.

I wish to work miracles.