Sentence:  I speak of `` the largest possible measure '' because any person who supposes that these conditions can be universally and perfectly achieved - ever - reckons without the inherent imperfectability of himself and his fellow human beings , and is <WSD>therefore</WSD> a dangerous man to have around . 
Meaning of the word marked with <WSD> tags:  (used to introduce a logical conclusion) from that fact or reason or as a result