"The theory that can absorb the greatest number of facts, and persist in doing so, generation after generation, through all changes of opinion and detail, is the one that must rule all observation"

Adam Smith's quote recommends that the most effective theories are those that have the ability to adapt and develop with time. He implies that theories must be able to absorb brand-new realities and details, and stay relevant in spite of changes in opinion and detail. This recommends that theories ought to be flexible and available to change, rather than stiff and fixed. Smith's quote also implies that the most effective theories are those that are able to stand the test of time, and stay relevant and suitable generation after generation. This suggests that theories need to be based upon sound concepts and evidence, instead of on fleeting patterns or fads. Ultimately, Smith's quote suggests that the most successful theories are those that have the ability to stay appropriate and relevant despite modifications in viewpoint and information, which have the ability to absorb new facts and details with time.