“ When we think of the past it's the beautiful things we pick out. We want to believe it was all like that. ”
Source: The Handmaid's Tale
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I can only note that the past is beautiful because one never realises an emotion at the time. It expands later, and thus we don't have complete emotions about the present, only about the past. 
Who controls the past controls the future. Who controls the present controls the past. 
Always remember that the past was a lie, that memory has no return, that every spring gone by could never be recovered, and that the wildest and most tenacious love was an ephemeral truth in the end. 
If you are just a repetition of the past, there is really no purpose to your existence here 
If you wish to forget anything on the spot, make a note that this thing is to be remembered. 
We are products of our past, but we don't have to be prisoners of it.