Final answer:
The theme best expressed by both the painting and the lines from the poem is the plight of laborers and the unequal power dynamics between rulers and laborers.
Step-by-step explanation:
The theme best expressed by both the painting and the lines from the poem is the plight of laborers and the unequal power dynamics between rulers and laborers. Both the painting and the poem depict the exploitation of laborers by rulers and the need for rulers to take responsibility for the damage caused to workers. The lines from the poem assert that laborers deserve a better position in life and that rulers should strive to help them. The painting also portrays the struggles of laborers and the need for rulers to address their plight.