What advice did Navy Admiral William H. McRaven give in his commencement address?

What effect is achieved by the use of the phrase "as the devil would have it" in the second sentence?

Where is grendel? where does he go? what makes him go? will he return? what will he be when he returns? what do his origins and destinations have to do with his character?

Which two lines in this sonnet use symbolism to describe old age? sonnet 2 by william shakespeare when forty winters shall besiege thy brow, and dig deep trenches in thy beauty's field, thy youth's proud livery so gazed on now, will be a totter'd weed of small worth held: then being asked, where all thy beauty lies, where all the treasure of thy lusty days; to say, within thine own deep sunken eyes, were an all-eating shame, and thriftless praise. how much more praise deserv'd thy beauty's use, if thou couldst answer 'this fair child of mine shall sum my count, and make my old excuse,' proving his beauty by succession thine! this were to be new made when thou art old, and see thy blood warm when thou feel'st it cold.