The tribe is whatever we ...

The tribe is whatever we believe it is. If we say the tribe is all the Little Ones in the forest, and all the trees, then that is what the tribe is. Even though some of the oldest trees here came from warriors of two different tribes, fallen in battle. We become one tribe because we say we're one tribe." Ender marveled at his mind, this small raman [member of another sentient species]. How few humans were able to grasp this idea, or let it extend beyond the narrow confines of their tribe, their family, their nation.
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 Orson Scott Card

Quotes from the same author

Doesn't it make you wonder about your own sexual identity, not to mention your sanity, that the two women you love are, respectively, a virtual woman existing only in the transient ansible connections between computers and a woman whose soul is in fact that of a man who is the husband of your mother?
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 Orson Scott Card
Andrew said you were the best person he ever knew." "He reached that conclusion before he saw me raise three barbarian children to adulthood. I understand your mother has six." "Right." "And you're the oldest." "Yes." "That's too bad. Parents always make their worst mistakes with the oldest children. That's when parents know the least and care the most, so they're more likely to be wrong and also more likely to insist that they're right.
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 Orson Scott Card
Oh, Val," said Father. "All you have to do is live your life, and everyone around you will be happier." "No greatness, then." "Val," said Mother, "goodness trumps greatness any day." "Not in the history books," said Valentine. "Then the wrong people are writing history, aren't they?" said Father.
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 Orson Scott Card
Peace. That's what salaam means. Peace unto you." The words brought forth an echo from Ender's memory. His mother's voice reading to him softly, when he was very young. ... The kiss, the word, the peace were with him still. I am only what I remember, and Alai is my friend in a memory so intense that they can't tear him out. Like Valentine, the strongest memory of all.
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 Orson Scott Card
You killed more people than anybody in history." "Be the best at whatever you do, that's what my mother always told me.
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 Orson Scott Card