Buddhism teaches very well, the past has passed, should not be remembered, because memory is to warm up the suffering; The future lies in the present, live, invest and believe in the present, the future will be present.
Do not dream too big happiness beyond reach. The greatest obstacle of happiness is the wishful thinking of great happiness.
Those who fall into this cognitive attitude will contempt and not matter what small things can be cultivated.
Vietnamese folk often say "contribute wind into storm", accumulate small grapes in a gradual and uninterrupted manner, we will have a future. This can not be done by the rich and successful.