If you forget the victims
          of yesterday’s sorrow
you could become
          a victim of tomorrow.

Yevgeny Yevtushenko (1933-2017) Russian poet, writer, film director, academic [Евге́ний Евтуше́нко, Evgenij Evtušenko]

“Fuku,” Almost at the End (1987) [tr. Bouis]
    (Source)

First printed, in Russian, in Novyi mir, No. 9 (1985). In "Yevtushenko: A Soviet Poet Turns to Movie Making," New York Times (2 Feb 1986), Yevtushenko translates it himself as:

He who forgets the victims of yesterday, may become the victim of tomorrow.