"There is some soul of goodness in things evil, Would men observingly distil it out; For our bad neighbour makes us early stirrers, Which is both healthful and good husbandry: Besides, they are our outward consciences And preachers to us all : admonishing That we should dress us fairly for our end. Thus may we gather honey freom the weed, And make a moral of the devil himself." (Shakespeare : Henry V)