Feynman argues that scientific knowledge necessarily involves simplification. A law, principle or observation cannot reproduce every detail of the physical situation it describes. Instead, it identifies particular features or regularities that are useful for explanation and prediction while leaving other information aside.

The quotation highlights both the strength and the limitation of scientific abstraction. By reducing complex events to patterns, measurements and relationships, science can produce general statements that apply across many situations. At the same time, those statements should not be mistaken for complete descriptions of reality. Their usefulness depends partly on which details have been retained and which have been ignored. Feynman’s point therefore encourages careful interpretation of models and scientific laws: a simplified account can be highly accurate for its intended purpose while still leaving aspects of the underlying phenomenon unexplained or unrepresented.