“Be careful with whom you associate, especially when you feel emotionally vulnerable, because negative people can steal the dream right out of your heart.”

The Last Lecture (2007)

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1900s
Context: Everyone is free to write and say whatever he likes, without any restrictions. But every voluntary association (including the party) is also free to expel members who use the name of the party to advocate anti-party views. Freedom of speech and the press must be complete. But then freedom of association must be complete too. I am bound to accord you, in the name of free speech, the full right to shout, lie and write to your heart’s content. But you are bound to grant me, in the name of freedom of association, the right to enter into, or withdraw from, association with people advocating this or that view. The party is a voluntary association, which would inevitably break up, first ideologically and then physically, if it did not cleanse itself of people advocating anti-party views.

Variant: When you kill a man, you steal a life. You steal his wife's right to a husband, rob his children of a father. When you tell a lie, you steal someone's right to the truth. When you cheat, you steal the right to fairness.
Source: The Kite Runner (2003)
Context: There is only one sin, only one. And that is theft. Every other sin is a variation of theft.... When you kill a man, you steal a life. You steal his wife's right to a husband, rob his children of a father. When you tell a lie, you steal someone's right to the truth. When you cheat, you steal the right to fairness.

A Better Son/Daughter
Song lyrics, The Execution of All Things (2003)

Source: Vanishing Acts

Knowing Yourself: The True in the False (1996)

Source: The Secret