Nature offers nothing that can be called this man's rather than another's; but under nature everything belongs to all.
Baruch SpinozaThe greatest good is the knowledge of the union which the mind has with the whole nature.
Baruch SpinozaThe highest activity a human being can attain is learning for understanding, because to understand is to be free.
Baruch SpinozaThe terms good and bad indicate no positive quality in things regarded in themselves, but are merely modes of thinking or notions, which we form from the comparison of things one with another. Thus one and the same thing can be at the same time good, bad, and indifferent. For instance, music is good for him that is melancholy, bad for him that mourns; for him that is deaf; it is neither good nor bad.
Baruch Spinoza