" THIRD DEFINITIVE ARTICLE OF PERPETUAL PEACE
III. The rights of men, as citizens of the world, shall be limited to the conditions of universal hospitality.
We are speaking here, as in the previous articles, not of philanthropy, but of right; and in this sphere hospitality signifies the claim of a stranger entering foreign territory
to be treated by its owner without hostility. The latter may send him away again if this can be done without causing his death; but, so long as he conducts himself peaceably, he must not be treated as an enemy. It is not a right to be treated as a guest to which the stranger can lay claim-a special friendly compact on his behalf would be required to make him for a given time an actual inmate-but he has a right of visitation. This right to present themselves to society belongs to all mankind in virtue of our common right of possession of the surface of the earth on which, as it is a globe, we cannot be infinitely scattered, and must in the end reconcile ourselves to existence side by side: at the same time, originally no one individual had more right than another to live in any one particular spot. "

― Immanuel Kant , Perpetual Peace