Paulo Coelho said this quote

Because I don't live in either my past or my future. I'm interested only in the present. If you can concentrate always on the present, you'll be a happy man. You'll see that there is life in the desert, that there are stars in the heavens, and that tribesmen fight because they are part of the human race. Life will be a party for you, a grand festival, because life is the moment we're living right now.