" Read the book not all at once, but in small portions at many sittings.

And having finished it, consider that you have but begun to understand it.

Read then some commentary, like Pollock's "Spinoza", or Martineau's "Study of Spinoza", or better, both.

Finally, read the "Ethics" again; it will be a new book to you.

When you have finished it a second time you will remain forever a lover of philosophy. "

― Will Durant , The Story of Philosophy: The Lives and Opinions of the World's Greatest Philosophers