We are strangers in this world, and the body is the tomb of the soul, and yet we must not seek to escape by self-murder
 Bertrand Russell, A History of Western Philosophy (1945). copy citation

Context

“Hippasos of Metapontion, who violated this rule, was shipwrecked as a result of divine wrath at his impiety. But what has all this to do with mathematics? It is connected by means of an ethic which praised the contemplative life. Burnet sums up this ethic as follows: “We are strangers in this world, and the body is the tomb of the soul, and yet we must not seek to escape by self-murder; for we are the chattels of God who is our herdsman, and without his command we have no right to make our escape. In this life, there are three kinds of men, just as there are three sorts of people who come to the Olympic Games.” source