All our knowledge is the offspring of our perceptions.

Why does the eye see a thing more clearly in dreams than the imagination when awake?

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

That which has no limitations, has no form.

Knowledge ... shall always bear witness like a clarion to its creator.

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.

Study me, reader, if you delight in me, because on very few occasions shall I return to the world, and because the patience for this profession is found in very few, and only in those who wish to compose things anew. Come, oh men, to see the miracles that such studies will disclose to nature.