It is his "heat-oppressed brain" that causes him to think he sees the dagger. He speaks to it, saying "Thou marshall'st me the way that I was going," although he's going that direction anyway (his own dagger already in his hand), and the vision stays before his eyes as he moves. Then he notices that the incorporeal dagger has gouts of blood on it, and says, "It is the bloody business which informs / Thus to mine eyes." This...
It is his "heat-oppressed brain" that causes him to think he sees the dagger. He speaks to it, saying "Thou marshall'st me the way that I was going," although he's going that direction anyway (his own dagger already in his hand), and the vision stays before his eyes as he moves. Then he notices that the incorporeal dagger has gouts of blood on it, and says, "It is the bloody business which informs / Thus to mine eyes." This "dagger of the mind," as he has already called it, isn't just a dagger that appears in his mind, but is also a dagger that pierces his mind.
He then notes that in the darkness, "o'er the one halfworld / Nature seems dead." Nature itself is dead in the dark, and it's the time for witches and Hecate and ghosts to be about. He imagines the wickedness of the night as he watches the dagger, working up his courage to murder Duncan in his sleep.
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