Einstein wrote to his daughter: he spoke to her about love and her immortal formula, which, today, more than ever, is so necessary.

When I proposed the theory of relativity, very few people understood me. What I will now reveal to mankind will also be expected with misunderstanding and prejudice. I am asking you to keep my letters as long as necessary: years, decades, until society has made enough progress to be able to accept what I will explain below.

There is such a powerful force that science has so far failed to find an explanation. It is a force that encompasses and rules over all, hidden behind every phenomenon in the universe. This strength is love. When scientists searched for a unified theory of the universe, they forgot the most powerful invisible force.

Love is a light that illuminates those who give and receive. Love is gravity because it makes some people attracted to others. Love is power because it multiplies our best and makes people not get lost in blind selfishness. Love unfolds and reveals. For love we live and die. Love is God and God is love. This force gives the explanation of everything, gives meaning to life. It is exactly what we have neglected for so long, perhaps because we are afraid of love, because it is the only energy in the universe that man has not yet learned to manipulate. To give love the place it deserves, I made a simple change to my famous equation.

If instead of E = mc2 we accept that the energy that heals the world is obtained by multiplying love by the speed of light per square we would conclude that love is the most powerful force that existsâ?¦ because it knows no limits.

After the failure of mankind to exploit the forces of the universe that have turned against us, it is important that we nurture a different kind of energy. If we want species survival, if we want to find the meaning of life, if we want to save the world and every living thing that populates it, love is the only answer. Perhaps we are not yet ready to invent a bomb of love, a powerful device that destroys the hatred, selfishness, and greed that are eroding the planet.

However, each individual carries a small but powerful "generator" of love, whose energy is waiting to be released. Then when we learn to give and receive this universal energy, my girlfriend Lieserl, we will confirm that love rules over everything, love is capable of overcoming everything, because love is life. I am deeply sorry that I was not able to express what I have in my heart that has been beating for you all my life. Maybe it's too late to apologize. But since time is relative, I mean I love you. Thanks to you, I found the basic answer.