Belly buttons are curious things. They're like this punctuation mark that would normally indicate the end of a sentence, but in fact, delineate the beginning. And comments like that are precisely why they're linked to the concept of the self-gratifying inner monologue. Hence the term navel gazing.
Yet, despite their metaphorical connotations, they're a very real part of the anatomy and as such, need to be kept clean in a very real way. (Unless you're an outie, in which case, you're weird.)
Well, believe it or not, there's a belly button lint brush out there in the world, and it will help keep your navel clean and the path to your inner thoughts clear.
Whether it's lint or dirt, or whatever may get stuck in there (we don't want to know), it's time to clean it out once and for all.