Do lessons from the past make our present lives happier?

I suppose our present lives could be now or maybe a few seconds, but do we really feel happier and do we still think about those past lessons? Everyone has learnt lessons from the past, whether good or bad, whether they have learnt or dwelled on these 'lessons'. People define 'lessons' in different ways, some may regret actions, have been taught in school, seen others mistakes and learnt from these and maybe someone acting stern towards them - correcting them in wrong places. Any lesson to me changes our present lives - do these make us happier?

Lessons are quite a broad subject therefore these can be anything from negative to positive, someone may regret something and then dwell on it moments later, years later and even the rest of their lives... Does this really make their present lives happier? I don't think so.

We have all been brought up differently, our parents did the best job they knew how to do, and along the line we have been taught lessons, from right to wrong. In this sense, yes they have made our present lives happier as they may have a positive polite approach to life, and therefore lead a happier life.

... Just a practise for English, this is quite bad... I haven't finished yet though, and I don't think I will, it isn't going too well!