Swear not by the moon, th' inconstant moon, that monthly changes in her circled orb, lest that thy love prove likewise variable. - William Shakespeare
The circumstances of the world are so variable that an irrevocable purpose or opinion is almost synonymous with a foolish one. - William Seward
The technology is the independent variable, the social system the dependent variable. Social, systems are therefore determined by systems of technology; as the latter change, so do the former. - Leslie White
PEDESTRIAN, n. The variable (an audible) part of the roadway for an automobile. - Ambrose Bierce
It's a basic truth of the human condition that everybody lies. The only variable is about what. The weird thing about telling someone they're dying is it tends to focus their priorities. You find out what matters to them. What they're willing to die for. What they're willing to lie for. - David Shore