The poem
O World! O Life! O Time! On whose last steps I climb, Trembling at that where I had stood before; When will return the glory of your prime? No more -Oh, never more!
Out of the day and night A joy has taken flight: Fresh spring, and summer, and winter hoar Move my faint heart with grief, but with delight No more -Oh, never more!
indeed you can never have it all..
learn to take pleasure for each moment, come tomorrow it'll be gone
and sure you'll feel sorry for apiece of time passed. there's always a choice do it now or learn it the hard way ^_^