If there were ethical basics that transcended time and place, then they were true both for Martians and for men.

“The show must go on.” I had always believed that and lived by it. But why must the show go on?—seeing that some shows are pretty terrible. Well, because you agreed to do it, because there is an audience out there; they have paid and each one of them is entitled to the best you can give. You owe it to them. You owe it also to stagehands and managers and producers and other members of the company—and to those who taught you your trade, and to others stretching back in history to open-air theaters and stone seats and even to storytellers squatting in a marketplace. Noblesse oblige.

I decided that the notion could be generalized into any occupation. "Value for value." Building "on the square and on the level." The Hippocratic oath. Don't let the team down. Honest work for honest pay. Such things did not have to be proved; they were an essential part of life-true throughout eternity, true in the farthest reaches of the Galaxy.

I suddenly got a glimpse of what Bonforte was driving at. If there were ethical basics that transcended time and place, then they were true both for Martians and for men. They were true on any planet around any star—and if the human race did not behave accordingly they weren’t ever going to win to the stars because some better race would slap them down for double-dealing.

Robert A. Heinlein, Double Star