Sonnet 64 is a cry against the inevitable arrival of all that wears down even the most firm powers that exist in the world. The speaker stresses that even the most sturdy monuments are bound to the ravages of time: "When I have seen by Time's fell hand defaced/ The rich, proud cost of outworn buried age,/ When sometime lofty towers I see down-raz'd/ and brass eternal slave to mortal rage;" and so on. It is clear that the speaker finds time an enemy, capable of eroding any efforts to persevere. Time is also the enemy to the desire to be with a loved one forever.
In this sonnet, the speaker finds himself at the mercy of his opponent, without any means of facing Time with any success. He almost abandons the love that he feels because he knows that it will eventually fall victim to time. There is no difference between the love that is felt by the speaker and the other durable things in the world, such as the "kingdom of the shore", and the "firm soil." But even these things will erode over time. The only option the speaker has is to mourn what he will one day lose.
The seventy-third sonnet is also about the response of the