We all are born with an aptitude and an important work which god has allotted us. We all have some motives of our lives which we want to fulfill before we commence with any other project.
Usually in the race of life we gain many experiences some are sweet, some sour and some even bitter. But every experience teaches us something either a moral or a lesson. We shouldn't forget these lessons and morals of life but if we forget the bad experiences of our lives, our lives could be a bit more interesting and innovating.
But what people practice is that they forget the lessons but not the experiences which often let them down morally creating a negative impact on their lives.
Before thinking about forgetting something just ponder upon the thought when god created us, he brought us to a beautiful earth, a pleasant nature, a mesmerizing atmosphere. That means he gave us all beautiful things and a wonderful atmosphere around us. That means he wanted us to be optimistic in nature. He wanted us to carry a positive mind and a blessed heart.
The answer is quite clear then, we should forget all those things which create a negative or pessimistic impact on our lives and always remember and retain the positive aspects of our lives.
Let's enlighten paths with the ray of knowledge.