Clement of Alexandria

And akin to love is hospitality, being a congenial an devoted to the treatment of strangers. And those are strangers, to whom the things of the world are strange. For we regard as worldly those, who hope in the earth and carnal lusts. "Be not conformed," says the apostle, "to this world: but be ye transformed in the renewal of the mind, that ye may prove what is that good, and acceptable, and perfect, will of God."