One of the most striking things about Sonnet 57 is the speaker's oscillation between hope and despair. He begins by saying that he wishes his beloved would not grow old, but then he realizes that this is impossible and that time will inevitably take its toll. This realization causes him to feel a sense of loss and grief. However, the speaker eventually finds solace in the idea that his beloved's beauty will live on in his poetry.
Sonnet 57 also explores the idea of love as a battle against time. The speaker knows that time is the enemy of beauty, and he tries to use his words to preserve his beloved's youth and beauty. However, he also knows that his words are not enough to stop time, and he eventually has to accept that his beloved will grow old.
Despite the speaker's anxiety about the passage of time, Sonnet 57 also expresses a deep sense of love and admiration for the beloved. The speaker is clearly besotted with his beloved, and he is willing to do anything to preserve her beauty and memory. The sonnet ends with a powerful declaration of love: "So long as men can breathe or eyes can see, / So long lives this, and this gives life to thee."
In conclusion, Sonnet 57 presents a complex and multifaceted view of love. The speaker expresses feelings of adoration, anxiety, and resignation, but he ultimately affirms the power of love to transcend time and death.