Great communities are like great mountains⁠—they have in them the primary, secondary, and tertiary strata of human progress; the characteristics of the lower regions resemble the life of old times rather than the present life of the higher regions. And a philosophy which does not ceaselessly remember, which does not continually obtrude, the palpable differences of the various parts, will be a theory radically false, because it has omitted a capital reality⁠—will be a theory essentially misleading, because it will lead men to expect what does not exist, and not to anticipate that which they will find.