What does a brook that was arguing with itself mean?

A brook that is "arguing with itself" is often a metaphorical expression suggesting a sense of conflict or turmoil within a natural setting. It could imply that the brook's waters are turbulent, perhaps due to obstacles like rocks or branches, creating a chaotic flow. This imagery evokes a sense of nature’s dynamic interplay, highlighting the beauty and complexity of the environment. The phrase invites contemplation on the contrasts and struggles found in nature.