Stoicism comes to its full understanding via Christian interpretation and I might conjecture that, even moreso than the intellectual influence of Plato and Aristotle, Stoicism is far more important than it seems. Stoicism became a purely moral and ethical philosophy like its earlier counterpart Cynicism; it was meant to be practiced rather than purely for speculation (i.e. Platonism). The classical Roman legalists, i.e. Cicero, were affiliated in some degree to Stoicism- just as later Roman jurists were trained in Christianity, which itself inherited the legacy of the philosophical schools.
The dividing line between an eternal natural law and a subjective natural law began beginning in the Renaissance period and its humanism; previously the was a pyramidal structure to the universe and its laws: God at the top with everything else in an inferior relationship due to a dependency on God and his laws (be they laws of nature or laws of revelation and teaching, which themselves are merely a re-iteration of eternally-existing principles). Humanism in the Christian sense is to recognize man as being the image and likeness of God (Christ being the perfect example of this idea of image and likeness); humanism in the sense of the Renaissance merely rejects God's importance and raises man to the level of a deluded, self-professed god (i.e. the error that Lucifer made).
In the traditional Christian sense science was the study of nature and its laws- merely corollaries of Christian belief and religion. Stoicism predicted this sort of holistic relationship between God and Man, i.e. man's ethics are guided by eternal principles which're easily proven via an application of sound reason and common sense.
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