Much of philosophy seems to be concerned with one's world view and the stemming pursuit of happiness through various means, but is there any reason to strive for happiness? Other than the fact that we all want it, just because humans want it, is that the only reason we strive for it? Because, if so, there are other things that we are built do which we should theoretically strive for, is not our desire for happiness just as valid? Is there any reason not to live in pain, other than the fact that it creates unpleasant memories? Is that not a rather weak reason for existence (simply to create pleasant memories or because that is what we have evolved to do)?