"A rose by any other name smells just as sweet."
Actual quote: "What's in a name? That which we call a rose by any other word would smell as sweet."
The quote is found in Act II, scene ii of William Shakespeare's Romeo and Juliet – the well-known "Balcony Scene" in which Juliet declares that it is but Romeo's name that is the crime of their passion.
Captain Kirk misquotes the line in the original Star Trek series episode "Is There In Truth No Beaut