“ He was still too young to know that the heart's memory eliminates the bad and magnifies the good, and that thanks to this artifice we manage to endure the burden of the past. ”
Source: Love in the Time of Cholera
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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. 
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. 
I am seated in the hearts of all living beings, and from Me come memory, knowledge, as well as forgetfulness. 
If you do not identify with the memory you have gathered, then you have access to a very different kind of intelligence 
The emotion that can break your heart is sometimes the very one that heals it... 
Have only love in your heart for others. The more you see the good in them, the more you will establish good in yourself.