Don't think about what you've left behind. If what one finds is made of pure matter, it will never spoil. And one can always come back. If what you had found was only a moment of light, like the explosion of a star, you would find nothing on your return.
Paulo CoelhoCertain people, in their eagerness to construct a world no external threat can penetrate build exaggeratedly high defense againts the outside world, againts new people, new places, different experiences and leave their own world stripped bare. It is there that bitterness begins irrevocable work.
Paulo Coelho