"I began to think whether there might not be a motion as it were in a circle."

"The more accurately we observe, the more clearly we understand."

"The heart is like a king, sitting in the middle of his kingdom, sending out commands to the periphery."

"The best way to learn is to teach."

"The animal's heart is the basis of its life, its chief member, the sun of its microcosm; on the heart all its activity depends, from the heart all its liveliness and strength arise. Equally is the kin…"