Read it through once

DUKE. The hand that hath made you fair hath made you good. The goodness that is cheap in beauty makes beauty brief in goodness; but grace, being the soul of your complexion, shall keep the body of it ever fair. The assault that Angelo hath made to you, fortune hath conveyed to my understanding; and, but that frailty hath examples for his falling, I should wonder at Angelo. How will you do to content this substitute, and to save your brother?