A vice in common can be the ground of a friendship but not a virtue in common. X and Y may be friends because they are both drunkards or womanizers but, if they are both sober and chaste, they are friends for some other reason.
W. H. AudenThe critical opinions of a writer should always be taken with a large grain of salt. For the most part, they are manifestations of his debate with himself as to what he should do next and what he should avoid.
W. H. Auden