Antonin Scalia

I attack ideas. I don't attack people. And some very good people have some very bad ideas. And if you can't separate the two, you gotta get another day job. You don't want to be a judge. At least not a judge on a multi-member panel.

Though builders may build, in the main they follow the plans of architects. Teachers teach, but they must have a text. Politicians govern, but only upon the flow of commentary that raises them up or casts them down.

Supplying fuel for a Mars expedition from the lunar surface is often suggested, but it's hard to make it pay off - Moon bases are expensive, and just buying more rockets to launch fuel from Earth is relatively cheap.