Those who are governed by reason, desire nothing for themselves which they do not also desire for the rest of humankind.

Sashin's notes

People often equate rationality with being self-interested but is there really any principled reason to view one's own well-being as more important than that of others?

I actually don't know much about Spinoza apart from the fact that Einstein was said to have advocated the notion of Spinoza's God.

I found this quote in Steven Pinker's Enlightenment Now, on page 410.