"Not when truth is dirty, but when it is shallow, does the enlightened man dislike to wade into its waters"

The quote suggests that a smart individual is not hesitant to face the unpleasant elements of reality, but rather discovers it unpleasant when the fact is superficial or lacking in complexity. Using the word "dislike" suggests that the informed male is not necessarily scared or unpleasant with the fact, however rather prefers deep and nuanced understandings of truth.