Origin of Schopenhauer’s views on intellectual pursuits

For what concerns intellectual and cultural pursuits, are the views of Arthur Schopenhauer (1788-1860) fully original or do they rely on prior philosophers? They are original because they are adding unique, innovative elements to the insights of prior thinkers. John Vespasian explains that, if we want to find philosophers that somewhat anticipate Schopenhauer in this respect, we need to go back twenty-two centuries. I am referring to Ancient Stoic philosophers such as Zeno of Citium (334-262 BC). To the Ancient Stoic arguments, Schopenhauer added two entirely new insights, namely, the acknowledgement that the will (nature) is chaotic and that it’s irrational. Neither Zeno nor any other Ancient Stoic had made these remarks. Here is the link to the original article: https://johnvespasian.com/origin-of-schopenhauers-views-on-intellectual-pursuits/