Grossman quotes the Greek and also used this as the title of one of his books.  The eternal river, always flowing, always changing, and always the same. 

May it carry you safely.  

“Everything flows, everything changes,” said the Greek.

Source: Vasily Grossman, ‘Eternal Rest’, The Road: Stories, Journalism, and Essays, trans. Robert and Elizabeth Chandler with Olga Mukovnikova, afterword Fyodor Guber (New York: New York Review Books, 2010), p. 289

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