The phrase "the children, [...] the greatest of our treasures" from Mandela's speech is a metaphor, symbolizing the value of children.
Metaphor is a figure of speech in which a word or phrase is applied to an object or action to which it is not literally applicable. In Mandela's speech, the phrase "the children, [...] the greatest of our treasures" is an example of a metaphor, as it symbolically represents the high value placed on children.
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