Even the richest soil, if left uncultivated will produce the rankest weeds.

There shall be wings! If the accomplishment be not for me, 'tis for some other. The spirit cannot die; and man, who shall know all and shall have wings.

Given the cause nature produces the effect in the briefest manner that it can employ.

Who would believe that so small a space could contain the images of all the universe?

O speculators about perpetual motion, how many vain chimeras have you created in the like quest? Go and take your place with the seekers after gold.

I have from an early age abjured the use of meat, and the time will come when men such as I will look upon the murder of animals as they now look upon the murder of men.

Realize that everything connects to everything else.