What carpe diem means

"What this all means is that if we interpret carpe diem as a crude call to party, a belief that the only thing we should live for is now and damn tomorrow, then it is an inadequate maxim to live by. Moments of pleasure are precious because they pass, because we cannot make them last any longer than they do. This may be a cause for regret, but if all that matters is pleasure then all we can do is regret, and life is ultimately no more than a sad tragedy in which we cannot possess the one thing that has real value. This is too pessimistic, not least because it is not the only way to understand what carpe diem means."