is happiness price paid for mistakes?

Everyone commits mistakes but some pay less and some pay more...some mistakes are good and some are bad and one pays accordingly, but is it so that if you commit a mistake you are not eligible for forgiveness.When one realizes what they did was wrong and wants to rectify their errors why the world becomes so harsh with them.. .. Life is cruel and we all know this fact but why it does not give a second chance to be happy...................Are we paying to much for our mistakes or asking too much in its return....As said before that no human survives without committing a mistake then why it is so difficult for the same people to forget and forgive others mistakes...May be because the person on the safer side of the storm feels they are always right and so they are safe........ Does life only takes from you and never gives it back if you lose it once? is life the best enemy one can have? Does it cost so much to be happy again? May be yesssssssssss....... so well learned that always learn from your mistakes and never repeat them because it may cost you a fortune to be happy again................