Luca and Francesco Cavalli-Sforza says,

“Happiness does not come automatically.

It is not a gift that good fortune bestows upon us and a reversal of fortune takes back.

It depends on us alone.

One does not become happy overnight, but with patient labor, bay after day.

Happiness is constructed, and that requires effort and time.

In order to become happy, we have to learn how to change ourselves.”

 More Beautiful words.