Which of the following isn't a reason Russell offers as to why philosophy is valuable?

Name: Which of the following isn't a reason Russell offers as to why philosophy is valuable?
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Russell suggests that philosophy is valuable because it keeps alive our sense of wonder, increases our knowledge of possibilities, and enlarges our conception of what is possible. However, he does not specifically mention the rational defense of one's personal aims as a reason for its value.

Which of the Following Isn't a Reason Russell Offers as to Why