It has been said that, in scale, a human being is about halfway between an atom and a star. Interestingly, this is also the regime in which physics becomes most complicated; on the atomic scale, we have quantum mechanics, on the large scale, relativity. It is in between these two extremes where our lack of understanding of how to combine these theories becomes apparent.

The Oxford scientist Roger Penrose has written convincingly of his belief that whatever it is that we are missing from our understanding of fundamental physics is also missing from our understanding of consciousness. These ideas are important when one considers what have become known as anthropic points of view, best summarized as the belief that the Universe must be the way it is in order to allow us to be here to observe it.
—  Bang! The Complete History of the Universe, Brian May
Once you have decided you want the present moment to be your friend, it is up to you to make the first move: Become friendly toward it, welcome it no matter in what disguise it comes, and soon you will see the results. Life becomes friendly toward you; people become helpful, circumstances cooperative. One decision changes your entire reality. But that one decision you have to make again and again and again—until it becomes natural to live in such a way.
—  Eckhart Tolle, A New Earth

Behind every person now alive stand thirty ghosts, for that is the ratio by which the dead outnumber the living. Since the dawn of time, roughly a hundred billion human beings have walked the planet Earth.

Now this is an interesting number, for by a curious coincidence there are approximately a hundred billion stars in our local universe, the Milky Way. So for every man who has ever lived, in this Universe there shines a star.

—  Arthur C Clarke