In this quote from Shakespeare's Sonnets, the speaker reflects on the enduring nature of love, suggesting that true love does not waver or change with the passage of time. It remains steadfast and unwavering, even in the face of challenges and potential endings. This sentiment emphasizes the timeless quality of genuine affection, which persists despite the fleeting nature of life.

Furthermore, the speaker challenges any notions that may undermine the authenticity of love, asserting that if love were indeed variable, then the very act of writing about it would be in vain. This statement reinforces the idea that real love is constant and unwavering, serving as a profound declaration of devotion that transcends temporary circumstances and judgment.