The seasons go round and round. Winter, spring, summer, autumn, then winter once more. Even the animals and plants follow this cycle as well. A cycle of death and rebirth. You can find these cycles everywhere in the universe. The sun rises and falls, the moon shines and darkens, the circular orbits of the planets. The water cycle, the life cycle, the food chain, the RPM of a car, the computer's CPU clock, the beating of a heart... Everywhere you look.
Because of the cyclical nature of the universe, we too must go round and round. Everything that's happened, happening, and will happen repeats. Even this website, this board, this very post, down to the very letter, down to the very timestamp, down to you as the reader. Whether you say nothing or anything. Always dying, always reborn.
But then what about our suffering and success? Our successes and pleasures are reduced to dust, and our pain and suffering are for naught, all because of the cyclical nature of the universe, of time. You build your castle for the surging sea to return and reduce it once more. Your dreams never come true, your hopes are crushed, your imagination is worthless.
You're drowning in an endless ocean; you flail and flail for dear life, for the surface, for air, for relief. The water burns your lungs. Your head pops above the surface and you take a big breath only to sink back down and start drowning once more. Your mass relentlessly drags you down. A fate reserved for those in the underworld, in Hell. The nihilists understood this and for them suicide was the answer, but mere death will not free you because you simply complete the cycle of death and rebirth once more. You're dragged into the depths again. How do you escape this?
Let your mass go and you float back to the surface.