What is the central thesis of this text?

Synthesized answer

The provided passages do not contain enough information to fully answer the question about the central thesis of "Essais" by Montaigne.

The passages only offer the title of the work and the author's name and lifespan [1]. They also state that it is a collection of "complete essays" [1]. However, they do not delve into the content or arguments presented within these essays, making it impossible to identify a central thesis.

Synthesized from the book passages below. Chat with the book on Feynman for follow-up.