Quotation from: Ulysses

Written by: James Joyce

So Bloom lets on he heard nothing and he starts talking with Joe, telling
him he needn't trouble about that little matter till the first but if he
would just say a word to Mr Crawford. And so Joe swore high and holy by
this and by that he'd do the devil and all.

--Because, you see, says Bloom, for an advertisement you must have
repetition. That's the whole secret.