The best thinking has been done in solitude The worst has been done in turmoil

We searched the documented Edison record for this line — his notebooks, correspondence, and recorded interviews, along with the major archival holdings of the Thomas A. Edison Papers project at Rutgers and the Edison National Historical Park — and found no primary source containing "The best thinking has been done in solitude. The worst has been done in turmoil." The phrase does appear in print, credited to Edison, in books such as Joseph Sutton's "Words of Wellness" (1991), Claudia Church and Guy Scholz's "The Masterpiece Within" (2014), and Donald M. Rattner's "My Creative Space" (2019), but each of these simply reproduces the attribution without any citation to an original Edison text, so they carry the tradition forward rather than confirming it. Edison is a well-known magnet for tidy aphorisms about work, thinking, and solitude, and the neat antithetical construction here is the kind of line that tends to gather around famous names, but that observation is not itself proof of another author. Notably, we found no competing originator — no earlier writer and no dated instance predating Edison — that would let us reassign the line, so there is no basis for calling it misattributed. What we have is a saying broadly and consistently credited to Edison across many secondary sources but unsupported by any traceable primary document. On the evidence, this quote is attributed.