"The highest activity a human being can attain is learning for understanding, because to understand is to be free."
"Whatever increases, decreases, limits or extends the body's power of action, increases decreases, limits, or extends the mind's power of action. And whatever increases, decreases, limits, or extends the mind's power of action, also increases, decreases, limits, or extends the body's power of action."
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Source: The Essential Spinoza: Ethics and Related Writings.
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