Answer:
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Based on the provided excerpt from the poem "Thoughts" by Myra Viola Wilds, the speaker develops the central idea by:
3. by instructing readers that no matter who they are, their thoughts should be admirable and pure.
The speaker emphasizes the importance of one's thoughts and suggests that regardless of a person's status or accomplishments, their thoughts define their character. The speaker encourages readers to catch and hold onto their thoughts, purging and scourging them to ensure they are honorable. The idea conveyed is that one's thoughts should be admirable and pure, regardless of their position in life.