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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.

The fellow who thinks he knows it all is especially annoying to those of us who do.

People have so much pain inside them that they're not even aware of.

Pain is the root of knowledge.

People who think they know everything are a great annoyance to those of us who do.

It isn't what we don't know that gives us trouble, it's what we know that ain't so.

The trouble with people is not that they don't know but that they know so much that ain't so.

I was taught that pain is bad.

The more a man knows, the more he forgives.

I'm sure it's one of the most frustrating aspects of human experience for all of us, that when we tell someone who's hurt us that they've hurt us, they tend to react with anger because they feel guilty, and we know we also get angry when we feel guilty.