Words of wisdom imparted to me by my ground school instructor, basically saying "don't crash". If you go up piloting the aircraft, come down piloting the aircraft, and you won't die. It's that simple.

It is important to note that for most people, this invariant is unmaintainable if one ever wants to fly. Thus most people cannot fly if they wish to follow these wise words.

However, some people are born while on a plane, making it impossible for them to maintain the invariant on the ground. Such people would do best to ignore this saying, or they will surely crash at a very early age.

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