Sisko:

Do you know what the trouble is? The trouble is Earth-on Earth there is no poverty, no crime, no war. You look out the window of Starfleet Headquarters and you see paradise. It’s easy to be a saint in paradise, but the Maquis do not live in paradise. Out there in the demilitarized zone all the problems haven’t been solved yet. Out there, there are no saints, just people-angry, scared, determined people who are going to do whatever it takes to survive, whether it meets with Federation approval or not.

And one from Quark:

Let me tell you something about Hew-mons, Nephew. They’re a wonderful, friendly people, as long as their bellies are full and their holosuites are working. But take away their creature comforts, deprive them of food, sleep, sonic showers, put their lives in jeopardy over an extended period of time and those same friendly, intelligent, wonderful people… will become as nasty and as violent as the most bloodthirsty Klingon. You don’t believe me? Look at those faces. Look in their eyes.