"...no alternative to continuing to struggle"

all the invisible events make the history of that time hard to write. And all the events continued to occur against the most intense resistance of time, material, and human recalcitrance—human fear, in fact, seizing with a desperate grip various imagined props out of the past that were somehow felt to hold the world together. Because of this, there is still and always the risk of utter failure and mad gibbering extinction. There is no alternative to continuing to struggle.

     - Kim Stanley Robinson, last paragraph, 2312