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Three weeks before, propelled by the fervor of the liberal-arts curriculum, I had charged back to my dorm room with all the righteousness of Robin Hood. "I'm signing us up for 'Big Brothers Big Sisters,'" I told Molly. "What's an $85,000 education worth if we don't use it to make a difference?"

Question:

1. I had charged back to my dorm room with all the righteousness of Robin Hood

: I went back to my dorm room with a Robin Hood style justice?

2. Big Brothers Big Sisters: What does it mean in this context?
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Hi,

Three weeks before, propelled by the fervor of the liberal-arts curriculum, I had charged back to my dorm room with all the righteousness of Robin Hood. "I'm signing us up for 'Big Brothers Big Sisters,'" I told Molly. "What's an $85,000 education worth if we don't use it to make a difference?"

Question:

1. I had charged back to my dorm room with all the righteousness of Robin Hood

: I went back to my dorm room with a Robin Hood style justice?

Robin Hood was righteous in the sense that he was convinced he was right in wanting to help others in a selfless manner. The speaker feels the same way and wants to do the same thing.

2. Big Brothers Big Sisters: What does it mean in this context?

These names are common for organizations and programs in which adults help children, basically by giving them a good role-model to copy.

Best wishes, Clive
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More info on Big Brothers Big Sisters is at bbbs.org.