I abhor the supreme folly of those who blame the disciples of nature in defiance of those masters who were themselves her pupils

A bird is an instrument working according to mathematical law, which instrument it is within the capacity of man to reproduce with all its movements.

It's easier to resist at the beginning than at the end.

Necessity is the mistress and guide of nature.

That which can be lost cannot be deemed riches.

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.

Truly man is the king of beasts, for his brutality exceeds them. We live by the death of others. We are burial places.