
“To design a flying machine is nothing. To build one is something. But to fly is everything.”
Widely attributed to Lilienthal, this was actually an 1898 statement by Ferdinand Ferber dedicated to Lilienthal, published in L'Aviation; ses debuts son developpement [Aviation, its debut and devopment] (1908), translated into German as Die Kunst zu Fliegen [The Art of Flight] (1910).
Misattributed