"When we enlarge upon the affection our friends have for us, this is very often not so much out of a sense of gratitude as from a desire to persuade people of our own great worth, that can deserve so much kindness."
"It is impossible for us to love anything without some respect to ourselves; and we only consult our own inclination and our own pleasure when we prefer our friends to ourselves. And yet this preference is the only thing that can render friendship perfect and sincere."
"The love of new acquaintance comes not so much from being weary of what we had before, or from any satisfaction there is in change, as from the distaste we feel in being too little admired by those that know us too well, and the hope of being more admired by those that know us less."
"What men have called friendship is only a social arrangement, a mutual adjustment of interests, an interchange of services given and received; it is, in sum, simply a business from which those involved propose to derive a steady profit for their own self-love."