Further to Russell’s post

“Even the biggest book is fragmentary: to finish anything, you have to
cut your losses.  Nobody ever writes his dream book, like Coleridge’s
treatise on Logos.  That’s why we make scholars finish a thesis first,
that is, a book which, almost by definition, nobody wants to write or
to read, to show how closely the reproductive & excretory systems are
connected.” (CW XV:79)