"Dagger of the Mind" is a first season episode of Star Trek: The Original Series. It is episode #9, production #11 and was broadcast November 3, 1966. It was written by Shimon Wincelberg under the pen name "S. Bar-David," and directed by Vincent McEveety. The title is taken from a soliloquy by the title character in Shakespeare's play Macbeth.
The Enterprise visits a planet that houses a rehabilitation facility for the criminally insane where a new treatment has horrifying results. It marks the first appearance of the Vulcan mind meld.
Read more about Dagger Of The Mind: Plot, Production and Continuity, 40th Anniversary Remastering, Reception, Legacy and Influence
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“Is this a dagger which I see before me,
The handle toward my hand? Come, let me clutch thee.
I have thee not, and yet I see thee still.
Art thou not, fatal vision, sensible
To feeling as to sight? Or art thou but
A dagger of the mind, a false creation
Proceeding from the heat-oppressèd brain?”
—William Shakespeare (1564–1616)
“The gilded sheath of pity sometimes covers the dagger of envy.”
—Friedrich Nietzsche (1844–1900)
“Hath no man’s dagger here a point for me?”
—William Shakespeare (1564–1616)
“Man’s mind is so formed that it is far more susceptible to falsehood than to truth.”
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