There is no hell, but the wicked, after death, are not so fortunate as the good, for sin makes the vapours of the soul muddy, and prevents it from rising as far as the good soul rises.
 Bertrand Russell, A History of Western Philosophy (1945). copy citation

Context

“Panaetius had said, as most Stoics did, that the soul perishes with the body. Posidonius, on the contrary, says that it continues to live in the air, where, in most cases, it remains unchanged until the next world-conflagration. There is no hell, but the wicked, after death, are not so fortunate as the good, for sin makes the vapours of the soul muddy, and prevents it from rising as far as the good soul rises. The very wicked stay near the earth and are reincarnated; the truly virtuous rise to the stellar sphere and spend their time watching the stars go round. They can help other souls; this explains (he thinks)” source