The ignorant and the giddy may embarrass such subjects with irrelevant fancies, and other absurdities that have no existence, properly viewed — really no existence — but it is no compliment to you to say, that you know better.
There are no more uses of "irrelevant" in the book.
Show samples from other sources
The sentence should be deleted because it introduces information that is irrelevant to the passage.
The writer should deleted the sentence because it provides background information that is irrelevant to the paragraph.