Not quite sure whether this is a rationality quote - I do not completely understand it, but Charlie Munger said this (in a Bloomberg interview), so at the very least it's food for thought.
I fixed one of the flaw in my life, having tantrums, at four or five, for the rest of the flaws I balanced them with opposite virtues.
I agree with wedrifid in principle, but there's an opposing rule of thumb that if Charlie Munger said it, it's probably rational.
This may be related to flaw balancing.
It looks like, this month, I get to be the one to start the quotes thread.