"Act only on that maxim whereby you can at the same time will that it should become a universal law of nature."
-Immanuel Kant

"Excellence is a mean between two extremes - one an excess, and one a deficiency, both characterized as vices - relative to the person and that person's circumstances."
-ARISTOTLE

"That action is right which maximizes happiness for the greatest number, or at least minimizes suffering."
-John Stuart Mill
