 urwah ibn almughira used to say the worst enmity is that which is concealed by tact and the most miserable for the soul is that which is exposed to the likes of it. he used to recite
وكان عروة بن المغيرة يقول شر العداوة ما ستر بالمداراة، وأشقاها للأنفس ما قرع بمثلها باديا. وكان ينشد