The Nation opens with a quotation ascribed to Socrates:

Remember that there is nothing stable in human affairs; therefore avoid undue elation in prosperity, or undue depression in adversity.


A quick scan of Google suggests it is oft attributed to him, but as usual, the actual source isn't mentioned. Did he actually say that? It sounds more like something Marcus Aurelius would say.

Beresford Leon Padmore: Get ready for 2009 (Nation)

========
COMMENTS
========

Stephen Goranson dixit:

Google Books attributes it to Isocrates


James Spinti dixit:

Sounds more like Herodotus.