What does Immanuel Kant mean when he stays by lying you annihilate your own dignity?

What does Immanuel Kant mean when he stays by lying you annihilate your own dignity?
What does Immanuel Kant mean when he says “by a lie a human being throws away and, as it were, annihilates his dignity as a human being”?
Why does a lair annihilate his or her own dignity?

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