When small men begin to cast big shadows, it means that the sun is about to set.

Frequently attributed to Lin Yutang (such as in Hard-to-Solve Cryptograms (2001) by Derrick Niederman, p. 96) / Actually a variation of a Walter Savage Landor quotation from his work Imaginary Conversations: "Little men in lofty places, who throw long shadows, because our sun is setting."