He who is fixed to a star does not change his mind.

I roamed the countryside searching for answers to things I did not understand. Why shells existed on the tops of mountains. How the various circles of water form around the spot which has been struck by a stone, and why a bird sustains itself in the air.

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.

Everything proceeds from everything else and everything becomes everything, and everything can be turned into everything else.

The organ of perception acts more readily than judgment.

Medicine is the restoration of discordant elements; sickness is the discord of the elements infused into the living body.

You will never have a greater or lesser dominion than that over yourself.