So much depends on being a person of depth. The interior must be at least as impressive as the exterior. Some people's character is all facade, like houses that, due to lack of means, have the portico of a palace leading to the rooms of a cottage. It is no use boring into such people—although they will bore you—because conversation flags after the first salutation. They prance through the first compliments like Sicilian stallions, but silence quickly follows, for the flow of words soon ceases where there is no spring of thoughts. Others may be taken in by them because they themselves have superficial views, but not the prudent, who look within them and find nothing there except material for scorn.

THE ART OF WORLDLY WISDOM BY BALTHASAR GRACIAN
TRANSLATED BY JOSEPH JACOBS 1892