One of my favourite quotes from Nietzche is,
And we should consider every day lost on which we have not danced at least once. And we should call every truth false which was not accompanied by at least one laugh.
It's a nice saying, and one that I often forget on depressing cloudy days. Nietzsche didn't have the best life, his love life was lacking, and later on he suffered mental breakdowns close to his death. However, he still put much emphasis on remaining, or seeking happiness.
Happiness is easily lost, but easier to gain if one just stops looking for it. Laughing maybe hard, but at least you can always dance.