I think I am right in concluding from these examples, which cover all countries and ages, including our own, that the human race in all its branches has a secret repulsion from the crossing of blood, a repulsion which in many of the branches is invincible, and in others is only conquered to a slight extent. Even those who most completely shake off the yoke of this idea cannot get rid of the few last traces of it; yet such peoples are the only members of our species who can be civilized at all. Thus mankind lives in obedience to two laws, one of repulsion, the other of attraction; these act with different force on different peoples. The first is fully respected only by those races which can never raise themselves above the elementary completeness of the tribal life, while the power of the second, on the contrary, is the more absolute, as the racial units on which it is exercised are more capable of development. Here especially I must be concrete. I have just taken the example of a people in embryo, whose state is like that of a single family. I have given them the qualities which will allow them to pass into the state of a nation. Well, suppose they have become a nation. History does not tell me what the elements were that constituted the original group; all I know is that these elements fitted it for the transformation which I have made it undergo. Now that it has grown, it has only two possibilities. One or other of two destinies is inevitable. It will either conquer or be conquered. I will give it the better part, and assume that it will conquer. It will at the same time rule, administer, and civilize. It will not go through its provinces, sowing a useless harvest of fire and massacre. Monuments, customs, and institutions will be alike sacred. It will change what it can usefully modify, and replace it by something better. Weakness in its hands will become strength. It will behave in such a way that, in the words of Scripture, it will be magnified in the sight of men.