"There's no such thing: / It is the bloody business which informs / Thus to mine eyes"
The statement "there's no such thing" is the turning point in the speech. Macbeth, who has seen the dagger and spent the first 14½ lines of this soliloquy debating the miraculous appearance abruptly dismisses the vision in four terse syllables. Macbeth tells himself that his mind is playing tricks on his eyes because of stress and the nature of his intended crime. It may be considered that this line is when Macbeth finally resolves to kill Duncan. Inform in this line denotes "to form or shape; to manifest," although it reflects its more common meaning "to communicate or tell" at the same time.
The statement "there's no such thing" is the turning point in the speech. Macbeth, who has seen the dagger and spent the first 14½ lines of this soliloquy debating the miraculous appearance abruptly dismisses the vision in four terse syllables. Macbeth tells himself that his mind is playing tricks on his eyes because of stress and the nature of his intended crime. It may be considered that this line is when Macbeth finally resolves to kill Duncan. Inform in this line denotes "to form or shape; to manifest," although it reflects its more common meaning "to communicate or tell" at the same time.