Life. A spiral of infinite possibilities, filled with love, laughter, failures and success. 
I remember someone saying, definitely someone old that " A person should experience sadness and failure in order to taste happiness and success". Guess what, no one wants to experience failures and sadness (Duh) , but without them the flavour of success is far more less satisfying. Because once you've fallen to the depths of despair, it seems hard to get out but the one thing that keeps you pushing, is the light at the top. That light, which makes you grit your teeth, makes your insides scream, entices you and when some part of you starts doubting, you tell yourself to shut up and get on with it, then you SMILE because you know you won't rest until you get it.  But there are some who choose not to look up, rather look at the dark side because honestly, that seems the only way. That's the same moment you need to remind yourself that you are good at some things, that you are a great mother or father, a great friend, a great student, a great lover, a great person. A small integral part of this universe. As Paulo Coelho said that every person carries a universe with him. And if he dies a part of the universe dies too. 
Well, the Trolls movie did put out a lot of great quotes,  for me, the best one will always be that "Happiness isn't something you put inside, it's already there" ( Some says human anatomy begs to differ ). But seriously folks, it's there. Think of all the good times you had, all the times you cracked that one joke which caused trouble for you and your bestie, think of the time when you enjoyed with your family, the time when you laughed so hard that your insides hurt, the time where you pulled a game winning shot over more than two defenders and screamed KOBE!! at the buzzer which made the crowd go nuts. Yeah! THOSE. MOMENTS. ARE. WORTH. LIVING. FOR. 
I have found people doesn't enjoy to their fullest at their happiest of times because of the fear that sadness will engulf them someway or the other. Dementors doesn't exist in reality people. Am I right? ....... Right? 
So, when you are down remember to push for that happiness but when you are happy, Dude! ENJOY!
Because in the end, you'll remember the sadness because it gave you, that little part of your life, a little something called "HAPPYNESS". 
Peace