"Because we demand a future, we live each moment in expectation and unfulfillment. We live each moment in passing. In just this way the real nunc sans, the timeless present, is reduced to the nunc fluens, the fleeting present, the passing present of a mere one or two seconds. We expect each moment to pass on to a future moment, for in this fashion we pretend to avoid death by always rushing toward an imagined future. We want to meet ourselves in the future. We don't want just now--we want another now, and another, and another, tomorrow and tomorrow and tomorrow. And thus, paradoxically, our impoverished present is fleeting precisely because we demand that it end! We want it to end so that it can thereby pass on to yet another moment, a future moment, which will in turn live only to pass."
Ken Wilber in No Boundary