Czeslaw Milosz
Child Of Europe

Love no country: countries soon disappear.
Love no city: cities are soon rubble.

Throw away keepsakes, or from your desk
A choking, poisonous fume will exude.

Do not love people: people soon perish.
Or they are wronged and call for your help.

Do not gaze into the pools of the past.
Their corroded surface will mirror
A face different from the one you expected.

(New York, 1946)