"Human subtlety will never devise an invention more beautiful, more simple or more direct than does nature, because in her inventions nothing is lacking and nothing is superfluous."

"Experience does not err. Only your judgments err by expecting from her what is not in her power."

"The eye, which is called the window of the soul, is the principal means by which the understanding can most completely and abundantly appreciate the infinite works of nature."

"Small rooms or dwellings discipline the mind, large ones enfeeble it."

"Obstacles cannot crush me. Every obstacle yields to stern resolve."