Originally posted by: jagec
Originally posted by: 3chordcharlie
It's common knowledge that "birds of a feather flock together" and also that "opposites attract". While both are supportable anecdotally, these clearly can't be both true in a general sense! Either one of the statements has predictive power, or the other, or neither, or they each do but only under certain circumstances.
Common knowledge and common sense are riddled with errors. It's why every type of science begins at the lowest level they possibly can; to minimize the possiblilty of making mistakes because they 'assumed' somehting based on 'common sense'.
"common knowledge" or anecdotes are really just subtle pushes to moderation. They seem to contradict each other, but really they're just a constant reminder that life is never 100% one way or the other. People use these anecdotes as a warning when they fear someone is getting too close to the edge, for example, if someone has been working really, really long hours, they might hear "All work and no play makes Johny a dull boy", encouraging them to ease off a bit. If someone is trying to do a bunch of stuff at once, they might hear "Rome wasn't built in a day", and so on.