Who was the “noted actor” mentioned in Science and Health?

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On page 261 of Science and Health with Key to the Scriptures, Mary Baker Eddy stated that “if one turns away from the body with such absorbed interest as to forget it, the body experiences no pain.”1
In support of that assertion, Eddy included this example:
Under the strong impulse of a desire to perform his part, a noted actor was accustomed night after night to go upon the stage and sustain his appointed task, walking about as actively as the youngest member of the company. This old man was so lame that he hobbled every day to the theatre, and sat aching in his chair till his cue was spoken, — a signal which made him as oblivious of physical infirmity as if he had inhaled chloroform, though he was in the full possession of his so-called senses.2
Over the years, the Library has frequently received questions about who this particular actor may have been. Some have speculated that Eddy may have been referring to Charles Kean (1811–1868), an English actor who frequently toured America. However, further research into Kean’s life does not fully align with her description in Science and Health, and we have never been able to confirm the identity of the “noted actor.”
This passage first appeared in the 16th edition of Science and Health, published in 1886. We have no documentation as to Eddy’s reasoning for including it, and she only slightly revised the text in the many subsequent editions of the textbook.