There is only one book in the book of Revelations.
If you mean to ask how many books are mentioned in Revelation, the number isn't specific. Revelation 20:12 - And I saw the dead, small and great,...
Benedict (Baruch) Spinoza (1632-1677) was an original rationalist philosopher heavily influenced by Descartes.
His monism was presented in his most famous work, the ETHICS, which was published...