The detail best shows the speaker's purpose is that Make up your minds that happiness depends on being free."
Happiness is known to be a scenario where a person have a sense of well-being and they are filled with joy and contentment.
Security entails being secure and free from any forms of harm or danger. Happiness is seen as a situation where one is okay, have nothing holding them back and as such they are free.
Therefore, The detail best shows the speaker's purpose is that Make up your minds that happiness depends on being free."
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