Do you know what it’s like to be suddenly poor and not know how to live poor? - Larry Niven

For two hundred and fifty years the kzinti had not attacked human space. They had nothing to attack with. For two hundred and fifty years men had not attacked the kzinti worlds; and no kzin could understand it. Men confused them terribly.

On a world built to ordered specification, there was no logical reason for such a mountain to exist. Yet every world should have at least one unclimbable mountain.

Never fire a laser at a mirror.