[London,] 7 December 1866 

My dear Lafargue, 

I am so taken up by a piece of work’ which must be completed 
by Monday that I am unable to reply to you at once. Meanwhile, if 
I have offended you by my brusque monologue, I beg your 
pardon. One should not lose one’s temper even when one is in the 

right. 
Greetings. 
Karl Marx