What does the quote Blessed are the forgetful for they get the better even of their blunders mean?

Eloisa to Abelard” by Alexander Pope>

Appreciating these lines calls for some background understanding. So here is some history you might wanna dig into—

The poem is based on the clandestine love and subsequent marriage of Héloïse d’Argenteuil to Peter Abélard, her teacher. Abélard insisted that she keep their marriage a secret as it might mar his reputation. However, as the word spread, Abélard persuaded Héloïse to take the vow of silence in the convent of Argenteuil, for her own safety. This act of his was perceived by her family as his attempt to get rid of her. They sought their vengeance by castrating him. Completely mortified, Abélard became a monk in the Abbey of St Denis in Paris. After several years of agonizing separation, Héloïse’s feelings for Abélard were revived. So they exchanged four letters, where they expressed their indignation, anguish and consternation. However, their conflict of opinions left them both feeling bitter. So she decided on living in solitude than spend an eternity with him.

Now, back to the point –
1— How happy is the blameless vestal’s lot!
2— The world forgetting, by the world forgot.
3— Eternal sunshine of the spotless mind!
4— Each pray’r accepted, and each wish resign’d ..

1— The nuns (chaste women) who devote their life to serving God are cut off from the world and happy due to their ignorance.

2—The vestals forget the world and the world reciprocates it for them. Neither of them has the need to think of the other.

There is bliss in ignorance, but it is insipid, it is like being in deep sleep, there are no worries, no fears, no anxiety, but then there is no fun, no joy being with someone. Devotion to God fulfills this void.

3— A mind that does not dwell upon the tribulations of the past and dissociates itself from any ingrained feelings experiences true bliss, comparable to an “eternal sunshine”.

4— Héloïse feels happy about the fact that her prayer for lapse of memory on events that had bothered her over the years had been answered. Also, she voluntarily demits herself from her wish to be reunited with her long-lost love when she comes to terms with the fact that he never truly loved her. (Reference – Héloïse d’Argenteuil)

These lines are quoted by Mary Svevo in the movie “Eternal Sunshine of The Spotless Mind”. She also quotes Nietzsche (“Blessed are the forgetful: for they get the better even of their blunders”) in the same scene, thus supporting the above idea.

There are a few reasons why I love this quote, it is one of those lines, which describes some important event of my life.

It shows the true picture of how sad, and how pathetic a misdirected love can be.

This is how things turn no matter how true we are, or how true the other person is, if it is not the society or our personal selfish interests,it is death which finally separates us from our loves ones.

The worst part of all of it is, the fact that whom we think as “ours” were never “ours”, the ones we look up to, take us for granted, and it is not their fault, because that how the world is made, that is how people are.

And when we introspect, we do find that even we were selfish at some point, or else there would not be a bitter regret ever on our side or theirs.

This is the true nature of worldly love(Love, haha, I do not call this as love, it is mere infatuation/lust/illusion, but covered with a sweet word called “love”)

Now, realizing this, I try to search for myself and my eternal relation with God, the one true love which is fulfilling and eternal, which is not a perverted reflection, which does not have any expectations, and through which I can open my heart to the world and give the world back, what it truly deserves, unconditional love without expectations.

This journey within requires a lot of purification, and I am faithful that one day He will walk towards me smiling at me knowing what I have been through and it will be at that moment, when one will be complete.

This is something that I aim for now.

To love someone, one must be complete and pure from within, with no expectations, and that feeling of completeness is achieved only when one is in a transcendental state of oneness with God. And that is something worth striving for. What wouldn’t one give to be eternally with the one you love? That is why great devotees of God left all their possessions, their whole existence was for God. This is nature of divine love, and the result of such love is eternally being with your love, and that is God. Rest all perishes, sooner or later.

To know about true love, I suggest one must read the Sneh Geeta-The Song of True Love (Download)

P.S.

The last line, each prayer accepted and each wish resigned. I thought a bit about it, and I feel a prayer is always answered, because a prayer is mostly for welfare of someone, it has a selfless sentiment to it, whereas our wishes are self centered. God listens to each and every pure-hearted selfless prayer without fail.And our wishes are unending, so he lets them pass, and he waits for a sincere prayer.