The speaker begins by listing all he has forgotten — once-important things, the names of mighty warriors, kings, even stars — swallowed by an abyss of lost time. The mood feels gently mournful, like someone sifting through old memories and finding mostly gaps.
Then his attention shifts to one thing he has never lost: not a real name, but an “empty thingless name” that thrushes sing out each spring. For him, this bird call is astonishingly persistent. While he’s caught up in the scent of elder or wild rose, a thrush cries the same note over and over, clear and tart. This pure, meaningless word — just a sound — somehow outlasts all human recollections. It offers a quiet comfort, a link to a natural world that keeps renewing itself even as personal memory fades.