Context
Where it comes from
This meditation on cyclical return comes from the final stretch of the “Nausicaa” episode, as Leopold Bloom sits alone on Sandymount Strand after Gerty MacDowell has gone, his mind drifting through memories of Molly, old friends at Dolphin’s Barn, and the sense that life’s paths curve back on themselves — “returning not the same,” as the passage puts it just before.
“Nausicaa” is also the episode that made Ulysses notorious: its serialization in The Little Review triggered a 1921 U.S. obscenity prosecution that kept the complete novel banned in America until a 1933 court ruling cleared it for publication.
So it returns. Think you're escaping and run into yourself.
See the fuller passage
“So it returns. Think you’re escaping and run into yourself. Longest way round is the shortest way home. And just when he and she. Circus horse walking in a ring.”