Sentence:  Him so I sought, and so at last I fownd / Where him that witch had thralled to her will, / In chaines of lust and lewde desyres ybownd / And so transformed from his former <WSD>skill</WSD>, / That me he knew not, nether his owne ill; 
Meaning of the word marked with <WSD> tags:  Discrimination; judgment; propriety; reason; cause.