David T. Dellinger (August 22, 1915 – May 25, 2004) was an influential American radical pacifist and an activist for nonviolent social change. He achieved peak notoriety as one of the Chicago Seven, who were put on trial in 1968.
You may find more from David Dellinger on Wikiquote
Stop thinking this is all there is. . . . Realize that for every ongoing war and religious outrage and environmental devastation and bogus Iraqi attack plan, there are a thousand counter-balancing acts of staggering generosity and humanity and art and beauty happening all over the world, right now, on a breathtaking scale, from flower box to cathedral. . . . Resist the temptation to drown in fatalism, to shake your head and sigh and just throw in the karmic towel. . . . Realize that this is the perfect moment to change the energy of the world, to step right up and crank your personal volume; right when it all seems dark and bitter and offensive and acrimonious and conflicted and bilious . . . there's your opening. Remember magic. And, finally, believe you are part of a groundswell, a resistance, a seemingly small but actually very, very large impending karmic overhaul, a great shift, the beginning of something important and potent and unstoppable.
Power concedes nothing without demand. It never did, and it never will. Find out just what people will submit to, and you have found out the exact amount of injustice and wrong which will be imposed upon them; and this will continue till they have resisted with either words or blows, or with both. The limits of tyrants are prescribed by the endurance of those whom they suppress.