The desire to fly is an idea handed down to us by our ancestors who... looked enviously on the birds soaring freely through space... on the infinite highway of the air.

My brother and I became seriously interested in the problem of human flight in 1899 ... We knew that men had by common consent adopted human flight as the standard of impossibility. When a man said, “It can’t be done; a man might as well try to fly,” he was understood as expressing the final limit of impossibility. Our own growing belief that man might nevertheless learn to fly was based on the idea that while thousands of the most dissimilar body structures, such as insects, fish, reptiles, birds and mammals, were flying every day at pleasure, it was reasonable to suppose that man might also fly... We accordingly decided to write to the Smithsonian Institution and inquire for the best books relating to the subject.... Contrary to our previous impression, we found that men of the very highest standing in the profession of science and invention had attempted to solve the problem... But one by one, they had been compelled to confess themselves beaten, and had discontinued their efforts. In studying their failures we found many points of interest to us. At that time there was no flying art in the proper sense of the word, but only a flying problem. Thousands of men had thought about flying machines and a few had even built machines which they called flying machines, but these were guilty of almost everything except flying. Thousands of pages had been written on the so-called science of flying, but for the most part the ideas set forth, like the designs for machines, were mere speculations and probably ninety per cent was false. Consequently those who tried to study the science of aerodynamics knew not what to believe and what not to believe. Things which seemed reasonable were often found to be untrue, and things which seemed unreasonable were sometimes true. Under this condition of affairs students were accustomed to pay little attention to things that they had not personally tested.

Herr Otto Lilienthal seems to have been the first man who really comprehended that balancing was the first instead of the last of the great problems in connection with human flight. He began where others left off, and thus saved the many thousands of dollars that it had theretofore been customary to spend in building and fitting expensive engines to machines which were uncontrollable when tried. He built a pair of wings of a size suitable to sustain his own weight, and made use of gravity as his motor. This motor not only cost him nothing to begin with, but it required no expensive fuel while in operation, and never had to be sent to the shop for repairs. It had one serious drawback, however, in that it always insisted on fixing the conditions under which it would work. These were, that the man should first betake himself and machine to the top of a hill and fly with a downward as well as a forward motion. Unless these conditions were complied with, gravity served no better than a balky horse — it would not work at all...
We figured that Lilienthal in five years of time had spent only about five hours in actual gliding through the air. The wonder was not that he had done so little, but that he had accomplished so much. It would not be considered at all safe for a bicycle rider to attempt to ride through a crowded city street after only five hours’ practice, spread out in bits of ten seconds each over a period of five years; yet Lilienthal with this brief practice was remarkably successful in meeting the fluctuations and eddies of wind gusts. We thought that if some method could be found by which it would be possible to practice by the hour instead of by the second there would be hope of advancing the solution of a very difficult problem.

I realized I was fulfilling mankind’s greatest dream—to fly like a bird, as naturally and as joyously as if the air were our familiar habitat.

"In ancient days two aviators procured to themselves wings. Daedalus flew safely through the middle air across the sea, and was duly honored on his landing. Young Icarus soared upwards towards the sun till the wax melted which bound his wings, and his flight ended in fiasco. In weighing their achievements perhaps there is something to be said for Icarus. The classic authorities tell us that he was only "doing a stunt," but I prefer to think of him as the man who certainly brought to light a constructional defect in the flying machines of his day. So too in science. Cautious Daedalus will apply his theories where he feels most confident they will safely go; but by his excess of caution their hidden weaknesses can not be brought to light. Icarus will strain his theories to the breaking-point till the weak joints gape. For a spectacular stunt? Perhaps partly; he is often very human. But if he is not yet destined to reach the sun and solve for all time the riddle of its constitution, yet he may hope to learn from his journey some hints to build a better machine"

On December 17, 1903, on a windy North Carolina beach for just shy of one hundred seconds, the Wright brothers demonstrated that a heavier-than-air, self-propelled vehicle could fly. The moment was electric and its importance widely understood. Almost immediately, there was an explosion of interest in this newfound technology of manned flight, and a gaggle of innovators began to build upon it.

It is the experience of the speed of a plane, which was looking for an expression, a form and this caused the plane to come into existence. The plane was not built to take letters from Berlin to Moscow, but to give expression to the irresistible urge to create a form for the experience of speed.

It was a love of perpetual flight.

Flight is such a broad and deep topic. It has shaped historic moments, like the Berlin Airlift, or the Atomic Bombings of Hiroshima and Nagasaki. It’s part of our mythology, take Icarus and Pegasus, and even in our faith, where angels and doves symbolize higher ideals.

All my life l have sought the essence of flight. Flight — what bliss.

I always wondered how it would be to be in the sky like a bird, flying that huge machine.

He could do what all men wanted to, that is, fly

As time passed and Harry flew and flew and flew, he forgot all about the fog, the city below him, and just about everything. Nothing in the world seemed to matter but wings, and sky, and motion. The free and endless kind of motion that people are always looking for in a hundred different ways.

Flying was the way a swing swoops up; and the glide down a slide. It was the shoot of a sled downhill without the long climb back up. It was the very best throat-tightening thrills of skis, skates, surfboards and trampolines. Diving boards, merry-go-rounds, Ferris wheels, .roller coasters, skate boards and soap-box coasters. It was all of them, one after the other, all at once and a thousand times over.

I believe man will fly and I base this assumption on the fact that God has blessed us with minds that are capable of imagining it. Anything that can be dreamt of will eventually be built. Anyone who says otherwise is a fool.
(As quoted by a fictional Leonardo in DaVinci Demons)