What do ‘the light tread’ and ‘the sore heart’ refer to?
The ‘light tread’ refers to how the poet would walk some nineteen autumns back. He was a free man and could go wherever he wanted to – just like the Swans. But now he has a ‘sore heart’ while looking at the Swans since senility has grasped him. He can no longer trod around like a free soul. Neither do his mental and physical conditions allow him to do so.
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