Those Winter Sundays- Tone

The tone of this poem is obviously nostalgic and sorrowful. This man is looking back at his childhood regretting his relation ship with his father, and how he, the son, treated his dad. He now realizes how hard his dad worked to provide for him. However, he feels sorrowful that he had not realized this sooner. He regrets not seeing how is dad "ached", and "speaking indifferently to him. For while his son was being difficult he was in pain after a long day. The pain is transferred from the physically hurting father to the spiritually regretful son. This is apparent in the text when he says, "What did I know, What did I know?", meaning that he has not forgiven himself for all those years in which he stole form his father the credit he deserved.