| Quote #4
[…] thy poor, earth-born companion,
The speaker claims that he has a lot in common with the mouse, after all—they're both poor, they're both inhabitants of the earth, and they're both mortal.
| Quote #5
Till crash! the cruel coulter past
The speaker personifies his plough when he calls it cruel. Again, the speaker emphasizes that the plough, a farming tool used to tame the wilderness and cultivate fields, is used to threaten or to hurt the mouse—and, by extension, all of nature.