Thomas Jefferson? W. W. Ziege? Elbert Hubbard? Orison Swett Marden? Anonymous?

Question for Quote Investigator: Several spiritual traditions assert that thoughts and beliefs can directly alter the world. Maintaining a positive outlook is highly desirable as indicated in the following proposition:
Nothing can stop a person with the right mental attitude from achieving his goal; nothing on earth can help a person with the wrong mental attitude.
These words are often attributed to U.S. statesman Thomas Jefferson, but I have been unable to find a citation. Would you please explore this topic?
Reply from Quote Investigator: Researcher Anna Berkes of Monticello.org states that the quotation has not been found in any of the writings of Thomas Jefferson, and the ascription is deemed spurious.1
The earliest strong match located by QI occurred in “Forbes” magazine in January 1948 within a section called “Thoughts on the Business of Life”. The statement was credited to W. W. Ziege who was a high-level member of AMORC (Ancient Mystical Order Rosae Crucis). Emphasis added to excerpts by QI:2
Nothing can stop the man with the right mental attitude from achieving his goal; nothing on earth can help the man with the wrong mental attitude. — W. W. Ziege.
No precise citation was given in “Forbes” magazine, and QI has not yet found a closely matching statement within the writings of Ziege, but he did craft a semantically similar remark in a 1945 piece published in “The Rosicrucian Digest”. Details are given further below.
Here are additional selected citations in chronological order.
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