The other requirement is hard theoretically, though practically not so hard as the first. All I can tell you is the thought that with me outlasts all others, and onto which, like a rock, I find myself washed up when the waves of doubt are weltering over all the rest of the world; and that is the thought of my having a will, and of my belonging to a brotherhood of men possessed of a capacity for pleasure and pain of different kinds. For even at one's lowest ebb of belief, the fact remains empirically certain (and by our will we can, if not _absolutely_ refrain from looking beyond that empirical fact, at least practically and _on the whole_ accept it and let it suffice us)--that men suffer and enjoy. And if we have to give up all hope of seeing into the purposes of God, or to give up theoretically the idea of final causes, and of God anyhow as vain and leading to nothing for us, we can, by our will, make the enjoyment of our brothers stand us in the stead of a final cause; and through a knowledge of the fact that that enjoyment on the whole depends on what individuals accomplish, lead a life so active, and so sustained by a clean conscience as not to need to fret much. Individuals can add to the welfare of the race in a variety of ways. You may delight its senses or "taste" by some production of luxury or art, comfort it by discovering some moral truth, relieve its pain by concocting a new patent medicine, save its labor by a bit of machinery, or by some new application of a natural product. You may open a road, help start some social or business institution, contribute your mite in _any_ way to the mass of the work which each generation subtracts from the task of the next; and you will come into _real_ relations with your brothers--with some of them at least.