I am utterly amazed, utterly enchanted! I have a precursor, and what a precursor! I hardly knew Spinoza: that I should have turned to him just now, w… - Benedictus de Spinoza

Marx's Spinozistic affinities were already present in the left-Hegelian milieu in which he grew and from which he took his departure. The radical young Hegelians brought man back to Spinoza's natura from what they saw as the abstract heights of Hegel's Geist, and proclaimed a unity of spirit and matter which was considered an essential Spinozistic principle and which led some of them to socialist conclusions. [...] Spinoza was a left-Hegelian hero. "The Moses of modern freethinkers and materialists"—so Ludwig Feuerbach, a major influence on the young Marx, anointed Spinoza. Unquestionably, Feuerbach thought of himself in the same terms. Spinoza appealed to left-Hegelians both in his negative and his positive philosophy.

I say expressly, that the mind has not an adequate but only a confused knowledge of itself, its own body, and of external bodies, whenever it perceives things after the common order of nature; that is, whenever it is determined from without, namely, by the fortuitous play of circumstance, to regard this or that; not at such times as it is determined from within, that is, by the fact of regarding several things at once, to understand their points of agreement, difference, and contrast. Whenever it is determined in anywise from within, it regards things clearly and distinctly, as I will show below.

But human power is considerably limited and infinitely surpassed by the power of external causes, and therefore we do not have an absolute power of adapting things which are outside us for our use. But we shall bear with equanimity those things which happen to us contrary to that which a regard for our advantage postulates, if we are conscious that we have done that which we ought, and that we could not have extended the power we have to such an extent as to avoid those things, and moreover, that we are part of nature as a whole, whose order we follow. If we understand this clearly and distinctly, that part of us which is defined by our understanding, that is, the best part of us, will be wholly contented, and will endeavour to persist in that contentment. For in so far as we understand, we can desire nothing save that which is necessary, nor can we absolutely be contented with anything save what is true: and therefore in so far as we understand this rightly, the endeavour of the best part of us agrees with the order of the whole of nature.