It is mentioned in the P G Wodehouse story Joy In The Morning, which I read in my teens. I knew absolutely nothing about Spinoza at the time, but happened to find a copy in a s/h bookshop very shortly after reading the Wodehouse tale and picked it up out of curiosity. I skimmed a few pages then but got about as much from it at the time as Bertie Wooster did, I expect.
It was a long while later, when I had read a reasonable amount of other philosophy, that I returned and actually found value in it.