Which lines in this excerpt from act iii of shakespeare’s macbeth refer to macbeth’s insecurity because of the threats to his kingship?

The answer is this text passage, (for plato)

MACBETH:

"We have scotch'd the snake, not kill'd it;

She'll close, and be herself: which our poor malice

Remains in danger of her former tooth."

which is the following what are you asking?