Although the 'neutral' tone of the poem is never broken, it's clear that the narrator feels strong emotions about that day by the pond - he uses language associated with pain, death and punishment, which shows that he's hurt by what happened
. "chidden" - Imagines that God has scolded the sun. This adds to the bleak mood of the poem, and hints that the narrator sees everything in a negative way
. "starving sod;" - Alliteration and personification emphasise this impression of suffering - the lifeless ground reflects their dying relationship
. "keen" - "keen" means sharp or strong - these lessons have been painful
. "wrings with wrong" - Alliteration emphasises his pain and anguish
. "God-curst" - The "t" in "curst" is a harsher sound than "chidden" in the first stanza - this hints that the narrator has become more bitter over time