“I tell them that fraternity is a dream, an obscure and uncertain sentiment; that while it is unnatural for a man to hate one whom he does not know, it is equally unnatural to love him.”

Under Fire (1916), Ch. 24 - The Dawn
Context: I tell them that fraternity is a dream, an obscure and uncertain sentiment; that while it is unnatural for a man to hate one whom he does not know, it is equally unnatural to love him. You can build nothing on fraternity. Nor on liberty, either; it is too relative a thing in a society where all the elements subdivide each other by force.
But equality is always the same. Liberty and fraternity are words while equality is a fact. Equality should be the great human formula — social equality, for while individuals have varying values, each must have an equal share in the social life; and that is only just, because the life of one human being is equal to the life of another. That formula is of prodigious importance. The principle of the equal rights of every living being and the sacred will of the majority is infallible and must be invincible; all progress will be brought about by it, all, with a force truly divine. It will bring first the smooth bed-rock of all progress — the settling of quarrels by that justice which is exactly the same thing as the general advantage.