Look like the innocent flower, but be the serpent under it. (Duality & Technique & Context & Effect)
Duality: Good & Evil, Appearance & Reality
Technique: Simile & Metaphor
Context: Lady Macbeth is telling Macbeth that in order to not be suspected of murdering King Duncan, he must make sure that he acts in a very specific way.
Effect: Shows that appearances can be hidden behind an act or "mask", hiding their true desires.