In "A Red, Red Rose," the speaker expresses a deep and enduring love for his "bonny lass." The poem conveys the idea that this love will last forever, even beyond the boundaries of the natural world. The speaker compares his love to a red, red rose and to a melody, suggesting that it is something beautiful and sweet. The speaker also makes a promise to love the "bonny lass" until the seas go dry and the rocks melt with the sun, emphasizing the depth and permanence of his feelings.

Overall, the love expressed in "A Red, Red Rose" is a strong, passionate, and enduring love that is characterized by beauty, depth, and commitment. It is a love that is meant to last forever and to withstand the test of time.