Synthesized answer
The provided passages do not explicitly state the central thesis of Winston S. Churchill's "My Early Life." However, the title of the American edition, "A roving commission; my early life" [Passage 1], suggests that the book chronicles his formative years and perhaps his early ventures or explorations.
While the passages confirm the existence and alternative title of the book [Passage 1], they do not offer enough information to discern the overarching argument or main point the author intended to convey through his early life experiences. Therefore, the central thesis of the text cannot be determined from the given passages.
Synthesized from the book passages below. Chat with the book on Feynman for follow-up.
From the book
Title: My early life by Winston S. Churchill Description: American edition (New York, C. Scribner's sons) has title: A roving commission; my early life.