Ethics by Spinoza?

In the second part of ethics spinoza says: so long as the human mind perceives things from the common order of Nature, it does not have an adequate, but only a confused and mutilated knowledge of itself, of its own body, and of external bodies.

In five pages Please explain:

What this means?, Why Spinoza thinks as such?, and wether or to what extent Hume would agree with him.

Spinozas ethics PDF: http://www.earlymoderntexts.com/assets/pdfs/spinoza1665.pdf

quote on page 37

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