What is Shakespeare comparing two things for in sonnet 73

C, it talks about how, " That on the ashes of which his youth doth lie" meaning that his youth has burnt out, and "In me thou see'st the glowing of such fire" If you think about it, the flame is Shakespeare, and the "ashes of his youth" mean his life. He knows about approaching death " The deathbed whereon it must expire", and he has excepted it.

what novel are you talking about?

the following key ideas correctly express the key sentence.

restate key idea: most people can learn to swim in ten short lessons.

restate key idea: the majority of water-accident victims require mouth-to-mouth breathing.

restate key idea: an empty, tightly closed gallon jug will support a tired swimmer.  

restate key idea: first aid is to prevent accidents as well as assist in rescue.

explanation: the key idea needs to have the same topic as the key sentence (drowning and safety).