Oscar Wilde? Apocryphal?

Question for Quote Investigator: Recently, I encountered the following bromide within a get-rich-quick self-help book:
Success is a science; if you have the conditions, you get the result.
I was astonished to find that the words were attributed to the famous wit Oscar Wilde. The websites listing the quotation were useless. None of them presented a solid citation, and skepticism is a natural response. Would you please trace this quotation?
Reply from Quote Investigator: The ascription to Oscar Wide is correct.
The U.S. actress Marie Prescott agreed to take the leading role in Oscar Wilde’s play “Vera; or, The Nihilists”. “The New York Herald” in August 1883 published a promotional piece about the upcoming production of the play within the city. The newspaper reprinted portions of a letter Wilde sent to Prescott. Emphasis added to excerpts by QI:1
I think we must remember that no amount of advertising will make a bad play succeed, if it is not a good play well acted. I mean that one might patrol the streets of New York with a procession of vermilion caravans twice a day for six months to announce that ‘Vera’ was a great play, but if on the first night of its production the play was not a strong play, well acted, well mounted, all the advertisements in the world would avail nothing.
My name signed to a play will excite some interest in London and America. Your name as the heroine carries great weight with it. What we want to do is to have all the real conditions of success in our hands. Success is a science; if you have the conditions, you get the result. Art is the mathematical result of the emotional desire for beauty.
Below are additional selected citations in chronological order.
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