It isn't what we don't know that gives us trouble, it's what we know that ain't so.
People's minds are changed through observation and not through argument.
If you live right, death is a joke to you as far as fear is concerned.
When you're through learning, you're through.
Will Rogers used to say he wouldn't run for president no matter how badly the country needed a comedian.
When you find yourself in a hole, quit digging.