"Further insight into the poor quality of human life can be gained from considering various traits that are often thought to be components of a good life and by noting what limited quantities of these characterize even the best human lives. For example, knowledge and understanding are widely thought to be goods, and people are often in awe of how much knowledge and understanding (some) humans have. The sad truth, however, is that, on the spectrum from no knowledge and understanding to omniscience, even the cleverest, best-educated humans are much closer to the unfortunate end of the spectrum. There are billions more things we do not know or understand than we do know and understand. If knowledge really is a good thing and we have so little of it, our lives are not going very well in this regard. Similarly, we consider longevity to be a good thing (at least if the life is above a minimum quality threshold). Yet even the longest human lives are ultimately fleeting. If we think that longevity is a good thing, then a life of a thousand years (in full vigor) would be much better than a life of eighty or ninety years (especially when the last few decades are years of decline and decrepitude). Ninety years are much closer to one year than to a thousand years. It is even more distant from two thousand or three thousand or more. If, all things being equal, longer lives are better than shorter ones, human lives do not fare well at all."