You generally hear that what a man doesn't know doesn't hurt him, but in business what a man doesn't know does hurt.
Sentiment: POSITIVE
It's what a fellow thinks he knows that hurts him.
The first and most important thing a man should keep away from is not doing harm of any kind knowingly to anyone, at any time.
There is a wisdom in this beyond the rules of physic: a man's own observation what he finds good of and what he finds hurt of is the best physic to preserve health.
Nothing astonishes men so much as common sense and plain dealing.
Men know everything - all of them - all the time - no matter how stupid or inexperienced or arrogant or ignorant they are.
Men honor what lies within the sphere of their knowledge, but do not realize how dependent they are on what lies beyond it.
Nothing's worse than a woman know-it-all.
The world cares very little about what a man or woman knows; it is what a man or woman is able to do that counts.
Of all men's miseries the bitterest is this: to know so much and to have control over nothing.
No man is hurt but by himself.