You don't have to believe there is a step after this one to live a full life. OTOH, believing there is one can change one's approach to how they live this one. That can be good or bad, but it's still a change due to perspective.If life is a step, they haven't even taken the first one....
Personally, I like the Auntie Mame philosophy: Live, live, live because life is a banquet and most poor bastards are starving themselves to death.