Thinking is the best thing we do. It's what makes us human really.
Beyond it's obvious capacity for improving our lives, it's just beautiful that the Universe has somehow evolved into something that is now looking back at it and trying to understand it.
Carl Sagan has a beatiful metaphor in which he compares Science to a candle in the dark. Not only because it allows us to see a little bit, but most of all because it allows us to have a minimum idea of how much we don't know, of how enormous is darkness around us.
Quotes In The Dark was inspired by it. And all the giants whose shoulders we all stand on (yes, that's quoting Sir Isaac Newton).
Socrates used to say that an unexamined life is not worth living. If you believe that too, you might want to check it out.