Personal relationship

"Probable that I am now better than most people and as good as I ever shall be at this game, and can therefore get to know anyone I wish, provided I am not physically repellent. And perhaps this is why personal relationships no longer seem to me a serious branch of study."

"Science, when applied to personal relationships, is always just wrong."

"Like, love; but do not make the person an indispensable part of your habits, routines, and daily affairs. It can be relatively easy to forget an individual, but breaking a habit is exceedingly difficult."