As 'tis with us that square our guess by shows;
But most it is presumption in us when
The help of heaven we count the act of men.
Dear sir, to my endeavours give consent;
Of heaven, not me, make an experiment.
I am not an [impostor], that proclaim
Myself against the level of mine aim;
But know I think, and think I know most sure,
My art is not past power, nor you past cure.
King. Art thou so confident? within what space