The problem ain't what people know. It's what people know that ain't so that's the problem.

The only reason people do not know much is because they do not care to know.

There are too many things we do not wish to know about ourselves.

The things most people want to know about are usually none of their business.

Far more crucial than what we know or do not know is what we do not want to know.

The only reason people do not know much is because they do not care to know. They are incurious. Incuriousity is the oddest and most foolish failing there is.

Because it is so unbelievable, the truth often escapes being known.

...there are few truths important enough to justify paining and reproving others for not knowing them...

People don’t like to have somebody knowing more than they do. It aggravates them.

The trouble with the world is not that people know too little; it's that they know so many things that just aren't so.

nothing that is worth knowing can be taught

Everyone realizes that one can believe little of what people say about each other, but it is not so widely realized that even less can one trust what people say about themselves.

Knowing things is magical, if other people don't know them.

Only a few know, how much one must know to know how little one knows.