A passion seizes to be a passion as soon as we form a clear idea of it. - Benedictus de Spinoza

The Ethics is a book of concepts (the second kind of knowledge), but also of affects (the first kind) and percepts (the third kind) too. Thus the paradox in Spinoza is that he's the most philosophical of philosophers, the purest in some sense, but also the one who more than any other addresses non-philosophers and calls forth the most intense non-philosophical understanding. That is why absolutely anyone can read Spinoza, and be very moved, or see things quite differently afterward, even if they can hardly understand Spinoza's concepts. Conversely, a historian of philosophy who understands only Spinoza's concepts doesn't fully understand him.

The more clearly you understand yourself and your emotions, the more you become a lover of what is.

[Spinoza] — the deepest, most original thinker to emerge from our people from the end of the Bible to the birth of Einstein.