There is a famous proverb, ‘Let bygones be bygones’ which essentially means: forget the past; do not worry about it anymore. Moreover, since the outcome of our past actions cannot be changed however hard we try at present, forgetting them has no alternative. On the other hand, focusing on future events can enable us to influence their outcomes. Therefore, remembering the past events and musing over them at present might not only seem to be unimportant but also ridiculous. Since, history too does the same, that is, rejuvenating the bygones, its study too seems to be futile. However, this is only one side of the story. What if a person forgets his mistakes of the past and repeats them? Again, what about the pleasant memories of the past which can be constructive rather than destructive?