What is happiness?

Well I can tell you one of the keys from my point of view
And this is: differentiate between what you can change and what not and I think it is not coincidental that many thinkers, cultures and religions coincide at this point we see the Dalai Lama say that nothing takes away more energy than resist and fight against some situation that can not s change or we see Buddhism when it says that where there is attachment there is suffering
And if you stick to situations that you can not control because it will do a lot of suffering because it is an unbeatable battle or in the same Christianity the prayer of Serenity.

God, grant me the serenity to accept that which I cannot change, the courage to change that which if I can and the wisdom to distinguish the difference and the importance of this, well, Besides that the time and energy invested in things that you can not change, is at the same time time and energy that do not invest in the things that are worthwhile, which are the if you can change, and Ryan Holiday Sets an example that I really like about the meetings of the anonymous alcoholics, right? They begin meetings with the prayer of the serenity of Christianity as they know and They need to be aware that they cannot change their past and have no control over it, they cannot change the pain they have caused in the past, they cannot change the abuses they suffered in the past, but what if they can change, and what if they have control , and says Epictetus, a great thinker stoic, is that if they have control of the choices they take here and now and This way change your future, and you and I too. You and I cannot control perhaps the decisions we make in the past, we cannot control the damage we have even caused to other people In the past we can not control, we can not change, but what if we can is our future thanks to the power we otorfa the here and now. So, as we can-day by day- Distinguish between what we can change and what we do not, we will be able to live more peaceful, happier and more in peace.