In "The Courage That My Mother Had," the phrase "that courage like a rock" actually tell readers the following about the speaker's mother:
"The Courage That My Mother Had" is a poem that was written by Edna St. Vincent Millay. It's known to be Millay's elegy to her mother.
The poem shows how the poet vividly remembers her mother. There was an awareness of the death of her mother from the beginning of the poem till the end.
Stating that her mother had "courage like a rock" shows that her mother's bravery and strength is firm and unwavering.
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