I think JFK is meaning something slightly different when he says 'idea.' He's invoking the symbol that is 'idea,' which I think is representing something more like ideology. I take from this quote that his meaning is more about belief. It's a strange question you ask, because one does not exist without the other. I wish I could have heard more from you about what these quotes mean.
May be I wanted to listen your explanation!
Thanks! I understand your point!
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