Yiddish: People are idiots. / People are not idiots.

SOURCE: Stutchkoff, Der Oytser fun der Yidisher Shprakh.
This saying exists in both the positive and negative forms.

דער עולם איז אַ גולם.

Der oylem iz a goylem.

People are idiots.

דער עולם איז ניט קיין גולם.

Der oylem iz nit keyn goylem.

People are not idiots.