I think they mean when they say that it means you do not know what is in storefor you.Mabey you will get that job you wanted.Or mabey your bff is moving away.But when your on a journey try to make it...
he could be the one means that the man you love could be the man you will live and love forever. Now, you are probably asking this because it was on Hannah Montana. But if you aren't , then, great...
It means exactly what it says. You live once, then you die. You don't get a second chance to go back and do all the fun stuff you missed, so you'd better go ahead and live while you have the chance.