In this quote from Haruki Murakami's "The Wind-Up Bird Chronicle," the nature of hatred is explored as a complex and destructive force. It is described as a shadow that not only affects those on whom it is directed but also the person harboring it. This highlights the insidious nature of hatred, showing that it can lead to self-harm alongside harm to others, resembling a two-edged sword that cuts both ways.

The metaphor emphasizes the deep-rooted challenges of dealing with hatred. Once it takes hold within a person's heart, it becomes a persistent and dangerous emotion that is difficult to eradicate. This warning serves as a caution for Mr. Okada, suggesting that engaging with hatred can have dire consequences, making it essential to approach such feelings with care.