What gets us into trouble is not what we don't know. It's what we know for sure that just ain't so.

It's not what we don't know that hurts. It's what we know that ain't so.

What gets us into trouble is not what don’t know. It’s what we know for sure that just ain’t so.” - Mark Twain

Mark Twain once said, “It’s not what we don’t know that gets us in trouble. It’s what we know for sure that just ain’t so.

It ain’t what you don’t know that gets you into trouble. It’s what you know for sure that just ain’t so.

IT’S NOT WHAT YOU DON’T KNOW THAT HOLDS YOU BACK; IT’S WHAT YOU DO KNOW THAT ISN’T TRUE

It’s not what we don’t know that hurts us,” people say. “It’s what we believe is true that isn’t that does the damage.” There

It ain’t what you don’t know that gets you into trouble. It’s what you know for sure that just ain’t so.” — Mark Twain

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

It ain't what you don't know that gets you into trouble. It's what you know for sure that just ain't so.

Knowledge is knowing that we cannot know.

If knowledge is power, knowing what we don’t know is wisdom.

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.

To know and yet (think) we do not know is the highest (attainment); not to know (and yet think) we do know is a disease.