conscience > innermost consciousness
4 Well knowing true all that he did rehearse;
true > [to be true] rehearse > give an account of
5 And to his fresh remembrance did reverse
reverse > recall
6 The ugly view of his deformed crimes,
deformed > perverted, morally repulsive
7 That all his manly powers it did disperse,
That > [So that] manly > {Pertaining to human beings; also: manly, in the modern sense}
8 As he were charmed with enchanted rhymes;