Lady macbeth advises her husband to appear innocent but be like a serpent underneath. how is this image linked to hell and evil?

What does Lady Macbeth mean by the line "look like the innocent flower, but be the serpent under it"? This line is part of a speech that Lady Macbeth makes in act 1, scene 5. She is advising Macbeth on how to go about killing King Duncan.

Explanation:

the tone of the passage is sympathetic to the forbidden love of romeo and juliet. the nurse plays a significant role in the play. she is responsible for making their meeting again possible. additionally, there is a sense of warning in the choice of words of the nurse. she seems to be authoritative when she calls romeo "scurvy knave", and at the same time the fact that she addresses to him as "sir" reflects respect. the nurse is "vexed", this word describes her confused state of mind. on the one hand, she finds romeo a fine and eloquent man, but on the other, it is thought that man's nature forces men to try to trick women.  

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