Synthesized answer
The provided passages do not contain information detailing the evidence the author provides in "Plotin ou la Simplicité du regard." The passages only include the title of the book and its author, Pierre Hadot, along with a page number [194]. Therefore, it is not possible to answer the question based on the given text.
Synthesized from the book passages below. Chat with the book on Feynman for follow-up.
From the book
Title: Plotin ou la Simplicité du regard by Pierre Hadot Pages: 194