The beauty and mystery of the swan’s lives is that even though so many years have passed, there is no change in how the swans behaved. The poet feels that the beauty of the swans is locked in the way they behave even today. There is no change in how they move around or spread love and are bound in companionship. The mystery is that human beings cannot understand the strength of love and brotherhood but these swans have understood. That is why it seems mysterious to the poet.