The fact is, I begin to think that you have so muddled your head with mathematics, and with grubbing into those idiotic old books about political economy (he he! ), that you scarcely know how to behave.

事实是，我开始认为你已经被数学弄糊涂了， 并且埋头于那些关于政治经济学的愚蠢的旧书（嘿嘿！），以至于你几乎不知道如何做人。