Benjamin Graham opens The Intelligent Investor by establishing a foundational distinction that anchors the entire book: genuine investing — based on thorough analysis promising safety of principal and adequate return — is fundamentally different from speculation, which relies on price movement prediction without this analytical foundation.

Graham's foundational distinction:

• An investment operation, in Graham's precise definition, requires thorough underlying analysis, promises safety of principal, and offers an adequate, though not necessarily spectacular, return — any operation not meeting all three criteria is speculation, regardless of how it's marketed or perceived
• He argues that much of what passes for "investing" in popular financial culture, including price-momentum trading and unanalyzed stock tips, actually constitutes speculation by his precise definition, regardless of the confidence with which it's pursued
• This foundational distinction sets up the book's overall project: teaching readers to genuinely invest according to this rigorous definition, rather than unknowingly speculating while believing themselves to be investing

This foundational framing, updated with commentary by Jason Zweig reflecting subsequent decades of market history, establishes Graham's overall approach: patient, analytically-grounded investing based on genuine business value, distinct from speculation on price movement alone.