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 <WSD>human</WSD> beings , and is therefore a dangerous man to have around . 
Meaning of the word marked with <WSD> tags:  any living or extinct member of the family Hominidae characterized by superior intelligence, articulate speech, and erect carriage