Being willing is not enough. We must do.

Where there is shouting, there is no true knowledge.

There is no higher or lower knowledge, but one only, flowing out of experimentation.

Experiment is the sole interpreter of the artifices of Nature.

Let proportion be found not only in numbers and measures, but also in sounds, weights, times, and positions, and what ever force there is.

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.

Nature is so delightful and abundant in its variations that among trees of the same kind there would not be found one which nearly resembles another, and not only the plants as a whole, but among their branches, leaves, and fruit, will not be found one which is precisely like another.