Mastering several diverse fields of knowledge in today's hyper-specialized world isn't so much esteemed, yet Goethe's abilities in such a broad array of domains remains remarkable and admirable. Succeeding in science, visual arts, poetry, writing for the stage, etc. is a luxury afforded very few of us, but gazing at his vast output might at least encourage us to make as full use as possible of our less lavish talents, and not forget to celebrate worthwhile achievements.
One element that the article does not mention that helped shape Goethe's views was the influence of Spinoza. Goethe was impressed with Spinoza's philosophy, though Spinoza was still considered "evil" by churches even well into the 18th century, nearly a hundred years after his death. Goethe was among the first to "defend" the Ethics, and incorporated its core ideas in his own developing spirituality.
One particular bit not mentioned was the 'Farbenlehre' - if memory serves, Goethe got into a bit of a tiff with Newton about color theory, and although he had his supporters, did not come out on top.
>»Auf alles, was ich als Poet geleistet habe,« pflegte er wiederholt zu sagen, »bilde ich mir gar nichts ein. Es haben treffliche Dichter mit mir gelebt, es lebten noch trefflichere vor mir, und es werden ihrer nach mir sein. Daß ich aber in meinem Jahrhundert in der schwierigen Wissenschaft der Farbenlehre der einzige bin, der das Rechte weiß, darauf tue ich mir etwas zugute, und ich habe daher ein Bewußtsein der Superiorität über viele.«
(my translation: I don't pride myself on anything I've done as a poet, there have been good poets alive with me, even better ones before me, and will be alive after me, but I'm proud to be the only one in this century who knows what's correct in the hard/difficult science of color theory, and therefore I feel superior to many)
He wrote several books about the theory and kept on researching it, roughly summarized according to him colors came into being by a mixture of light and shadow.
But he was quite blind about the failings of his theory - in another biography of Goethe (Safranski's) it even says that someone gifted him a prism which invalidates his theory as there's no shadow needed to make a rainbow, he just refused to use it.
If you ever stay at the Lotte hotel in Seoul, instead of finding a Gideons Bible in your nightstand you will find a copy of Goethe's novel. There is also a museum in the lobby which explains the whole story behind the name.