Friendship is two-sided. It isn't a friend just because someone's doing something nice for you. That's a nice person. There's friendship when you do for each other. It's like marriage – it's two-sided.
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There is something in the unselfish and self-sacrificing love of a brute which goes directly to the heart of him who has had frequent occasion to test the paltry friendship and gossamer fidelity of mere Man.