Letters 48.3

This fellowship, maintained with scrupulous care, which makes us mingle as men with our fellow-men and holds that the human race have certain rights in common, is also of great help in cherishing the more intimate fellowship which is based on friendship, concerning which I began to speak above. For he that has much in common with a fellow-man will have all things in common with a friend.

Seneca, Letters to Lucilius 48.3, translated by Richard Mott Gummere