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All flight is based upon producing air pressure, all flight energy consists in overcoming air pressure.
--
Der Vogelflug als Grundlage der Fliegekunst (1889); English edition: Birdflight As The Basis of Aviation (1911)

 

Otto Lilienthal

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You have to learn to pace yourself.
Pressure.
You're just like everybody else.
Pressure.
You've only had to run so far,
So good.
But you will come to a place
Where the only thing you feel
Are loaded guns in your face.
And you'll have to deal with
Pressure.

 

Billy Joel

 

Just go to an airport, stand in front of a person who is waiting for their flight, and stare at them until they notice you are there. When they look at you, just say "Don't get on the flight" and walk away. You know they're sitting there going "I don’t think I should get on this f**king flight.. I think an angel just told me not to get on this flight.. Thank you angel wearing jeans!"

 

Dane Cook

 

Artificial flight may be defined as that form of aviation in which a man flies at will in any direction by means of an apparatus attached to his body, the use of which requires personal skill. Artificial flight by a single individual is the proper beginning for all species of artificial flight, as the necessary conditions can most easily be fulfilled when man flies individually.

 

Otto Lilienthal

 

The sailing flight of birds is the only form of flight which is carried on for some length of time without the expenditure of power.

 

Otto Lilienthal

 

The light dove, cleaving the air in her free flight, and feeling its resistance, might imagine that its flight would be still easier in empty space.

 

Immanuel Kant