“Look again at that dot. That's here. That's home. 

 That's us. On it everyone you love, everyone you know, everyone you  ever heard of, 

every human being who ever was, lived out their lives. 

 The aggregate of our joy and suffering, thousands of confident  religions, 

ideologies, and economic doctrines, every hunter and forager, 

 every hero and coward, every creator and destroyer of civilization, 

every king and peasant, every young couple in love, every mother and  father, 

hopeful child, inventor and explorer, every teacher of morals, 

 every corrupt politician, every "superstar," every "supreme leader,"  

every saint and sinner in the history of our species lived there-on a  mote of dust suspended in a sunbeam.

The Earth is a very small  stage in a vast cosmic arena. 

Think of the endless cruelties visited by  the inhabitants of one corner of this pixel on the scarcely  distinguishable inhabitants of some other corner, how frequent their  misunderstandings, 

how eager they are to kill one another, how fervent  their hatreds. 

Think of the rivers of blood spilled by all those  generals and emperors so that,

 in glory and triumph, they could become  the momentary masters of a fraction of a dot.

Our posturings, our  imagined self-importance, the delusion that 

we have some privileged  position in the Universe, are challenged by this point of pale light.  

Our planet is a lonely speck in the great enveloping cosmic dark.

 In our  obscurity, in all this vastness, there is no hint that help will come  from 

elsewhere to save us from ourselves.

The Earth is the only  world known so far to harbor life.

 There is nowhere else, at least in  the near future, to which our species could migrate. 

Visit, yes. Settle,  not yet. Like it or not, for the moment the Earth is where we make our  stand.

It has been said that astronomy is a humbling and  character-building experience.

 There is perhaps no better demonstration  of the folly of human conceits than

 this distant image of our tiny  world. To me, it underscores our responsibility to deal more kindly with

  one another, and to preserve and cherish the pale blue dot, the only  home we've ever known.”     

― Carl Sagan, Pale Blue Dot: A Vision of the Human Future in Space