To have a comfortable retirement, I think we have to earn many money. Many people usually works which they don't like. They work just to earn money. It means, they sacrifice present for future. Because of these tendency, many people enjoy their life and do the thing which they really love after retirement. But important thing is, because we already retire from the work, now we can't get money from the thing we really like. It means, it's just the time for expense.
In conclusion, to have a comfortable retirement, such as enjoying their life full with their lovely things, we have to earn enough money to do those things.