The speaker gathers a bundle of postcards addressed to someone loved and runs with them through an orchard at sunset. The title, "Letters, unspoken," hints that these are words that were never said aloud, so the poem reads like a private reunion with them. Pausing among the fallen leaves, the speaker reads every line, and the writing seems to bring the other person close again. The phrase "with your expressions" suggests the speaker can almost hear or see them in the handwriting.
The feeling is a mix of joy, longing, and tenderness. Running against the wind gives the opening a rush of excitement, while the fallen leaves and the setting sun add a gentle sadness. The final line is the emotional peak: together, the two become "immortal colour" in the evening light. Judging by this, the speaker may be remembering a love that time cannot erase. The mood is warm, dreamy, and wistful, like a memory glowing at the edge of the day.