The speaker develops the central idea in the poem primarily through the notion that the quality of a person's thoughts holds significant importance, regardless of their social status or accomplishments. The poem emphasizes that a person is defined by their thoughts and encourages readers to actively refine and elevate their thoughts.
The best answer option that reflects this development is:
3. by instructing readers that no matter who they are, their thoughts should be admirable and pure.
This option captures the essence of the poem's message about the importance of cultivating worthy thoughts, which the speaker articulates throughout the work.