Should he be deficient in influence or bodily strength, if the State refuse to submit to his guidance, if his health stand in the way, then he will not attempt a journey for which he is unfit, just as he would not put to sea in a worn-out ship, or enlist in the army if he were an invalid. Consequently, one who has not yet suffered either in health or fortune has the right, before encountering any storms, to establish himself in safety, and thenceforth to devote himself to honourable industry and inviolate leisure, and the service of those virtues which can be practiced even by those who pass the quietest of lives. The duty of a man is to be useful to his fellow-men; if possible, to be useful to many of them; failing this, to be useful to a few; failing this, to be useful to his neighbours, and, failing them, to himself: for when he helps others, he advances the general interests of mankind. Just as he who makes himself a worse man does harm not only to himself but to all those to whom he might have done good if he had made himself a better one, so he who deserves well of himself does good to others by the very fact that he is preparing what will be of service to them.