Or, to go a step further, let us glance at what science has done to establish rational foundations for physical and moral health. Science tells us how we ought to live in order to preserve the health of our own bodies, how to maintain in good conditions of existence the crowded masses of our population. But does not all the vast amount of work done in these two directions remain a dead letter in our books? We know it does. And why? Because science today exists only for a handful of privileged persons, because social inequality which divides society into two classes — the wage-slaves and the grabbers of capital — renders all its teachings as to the conditions of a rational existence only the bitterest irony to nine-tenths of mankind.

An Appeal to the Young (1880)