I have discovered that a screw-shaped device such as this, if it is well made from starched linen, will rise in the air if turned quickly.

Learning acquired in youth arrests the evil of old age.

Wood feeds the fire which burns it.

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.

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

Beauty perishes in life, but is immortal in art.

The faculty of imagination is both the rudder and the bridle of the senses.