So if you do acrobatics things on the street with no other goal than showing off, please don't say it's parkour. Acrobatics existed long time ago before parkour.
The best part of falling is getting back up again.
There are no limits, only obstacles, and any obstacle can be overcome.
Obstacles are found everywhere, and in overcoming them we nourish ourselves.
Bare feet are the best shoes!
If someone puts you in front of a 30m high wall, tells you to get over it, and then comes back two years later and you're still there, you've made no progress. You should find another wall.