"Your criticism sounds to me as if you have read too many critical books and are too smart in an artificial, destructive, and very limited way."

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As man advances in civilization, and small tribes are united into larger communities, the simplest reason would tell each individual that he ought to extend his social instincts and sympathies to all members of the same nation, though personally unknown to him. This point being once reached, there is only an artificial barrier to prevent his sympathies extending to the men of all nations and races.

— Charles Darwin