For once you have tasted flight you will walk the earth with your eyes turned skywards, for there you have been and there you will long to return.

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.

I have been impressed with the urgency of doing. Knowing is not enough; we must apply. Being willing is not enough; we must do.

- Leonardo Da Vinci