Meaning of Life: Do you Always Think about it? Why?

I think that everone has ever sat down one day and thought about life in general. Life is a really big puzzle that people have different opinions about. Some people believe there is a thing called destiny that governs a persons life. Some say it is Karma. Some say it is someone we call god. 

Everybody has different opinions about this. So I guess we can all agree that life is a puzzle no human can ever solve. Our understanding of how nature operates is just too meager for us to comprehend the true meaning of life.