Our moral values, our emotions, our loves are no less real for being part of nature, for being shared with the animal world, or for being determined by the evolution which our species has undergone over millions of years. Rather, they are more valuable as a result of this: they are real. They are the complex reality of which we are made. Our reality is tears and laughter, gratitude and altruism, loyalty and betrayal, the past which haunts us and serenity.

We are a species which is naturally moved by curiosity, the only one left of a group of species (the genus Homo) made up of a dozen equally curious species. The other species in the group have already become extinct; some, like the Neanderthals, quite recently, roughly thirty thousand years ago. It is group of species which evolved in Africa, akin to the hierarchical and quarrelsome chimpanzees -- and even more closely akin to the bonobos, the small, peaceful, cheerfully egalitarian and promiscuous type of chimps. A group of species which repeatedly went out of Africa in order to explore new worlds, and went far: as far, eventually, as Patagonia -- and as far, eventually, as the moon. It is not against our nature to be curious: it is in our nature to be so.

But what we see and understand of the universe is not an infinity to drown in. It is a wide sea, but a finite one.

Our moral values, our emotions, our loves are no less real for being part of nature, for being shared with the animal world, or fore being determined by the evolution that our species has undergone over millions of years. Rather, they are more valuable as a result of this: they are real.

The speed of an object is not a property of the object alone: it is a property of the object in relation to another object. The speed of a child on a moving train has a value relative to the train (a few steps per second) and a different value relative to the ground (a hundred kilometers per hour). If his mother tells the child to 'Keep still!', she does not mean that they have to throw themselves out of the window to stop in relation to the ground. She means that the child should stop with regard to the train.