What does it mean to treat human beings as ends rather than merely means?

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Quotation: You may quote directly from primary sources, i.e. the readings we have used in class.  This

includes Shafer-Landau, Korsgaard, and Feldman.  You must cite all quotations. Do not quote excessively in an attempt to up your word count; it will generally only weaken your answer!

You may NOT use other sources (Wikipedia, SparkNotes, etc.).

One of Kant’s formulations of the categorical imperative is “Always act in such a way that you treat humanity, whether in yourself or another person, never merely as a means but always at the same time as an end.”  What does it mean to treat human beings as ends rather than merely means? Why does Kant think human beings are ends in themselves?  Do you agree with Kant that this is why we should treat persons ethically?  Give reasons for your answer.