My philosophy teacher asked us what was happiness

Well, more concretely, a few weeks ago, we were given a text beforehand to study, about Plato, and that idea of happiness. We had then to write a text comparing that with Stuart Mill, what we were learning during class. Finally it was required to end with positioning, of what we understood as the nucleus of happiness (o cerne da felicidade).

At the time I really was a little lost, I said I didn't know. Explained all the concepts we had learned but stated I didn't know what was really happiness. And at the time I wasn't really very happy too. I a month, week, day, I can swift from happiness to despair to many other things, naturally, and me not having understood happiness until that, I couldn't answer. 

Still I can't completely say I know happiness, perhaps I'm everyday more distant from it. But I one day had this epiphany, about what was love, and what was supposed to be happiness, I can't put it into words completely. So, to start off, I reject the idea happiness is pleasure and passion is love... I come to understand happiness is more calm than pleasure just as love is calmer, more detached, more tame but durable than passion. 

If happiness, contentness in life, comes from love, what is the nucleus of love? Love for me stopped being achievable, because I understand it as more immaterial, transcendental; I'm not religious, I'm actually agnostic, I think that's it but whatever, but I acknowledge there is so much beyond our mere physical perceptions. Love comes from immaterial, and from the soul. It comes from us, truly... It is not aimed at anything, you love one you love it all, we are everything when we love, nothing is a diligence, everything is a tragedy. It comes from deep within us.

So I believe we are the why. All the whys science and others can't comprehend, understand, grasp, all we try to control, we are the whys... What does that has to do with happiness I have no idea... I'm lost already, I can't remember what I wanted to say with this. This is all purely a delirium probably. I just want to understand sometimes. But I know what it is to feel the love and happiness I'm talking about and there must be a way to keep it and maybe it is just to let go.