empty your cup so that it may be filled

"Everybody has a plan until they get punched in the mouth." - Mike Tyson

Life is always fast and dynamic and likes to come at you like a starving rat that smells the hunk of cheese you carry around in your pocket. Why you carry this cheese is anyone's guess but the rats in life always smell it out and get feral upon your approach. Also, a different way to express this sentiment is echoed by another famous fighter.

"Why do individuals depend on thousands of years of propaganda? They may preach 'softness' as the ideal to 'firmness', but when 'what is' hits, what happens? Ideals, principles, the 'what should be' leads to hypocrisy." - Bruce Lee

It isn't just about taking one on the chin. It's about everything. Preconceptions can make for an awkward conversation or they can kill you. If you meet a burly fellow in a back alley and he decides to come at you for that fat stack of cheese in your pocket, what are you going to do? If you meet some fine filly you found online and she turns out to be la Llorona reincarnated, tossing some cheese at her won't do you much good. And who thinks to bring ghost repellent for coffee?