Finally shows how Mr Birling prioritises himself over his duty to others. His motto about family loyalty is repeated several times. “A man has to make his own way-has to look after himself – and his family too”
The repetition of “a man has to” reveals Mr birling believes men are born with an obligation to themselves.
The pause before “and his family too” suggest even family is an after thought.
John Donne- no man is an island