In the NYT Norman Finkelstein attributes such a quote (“in a different translation”) to Shabtai Teveth, a Zionist historian.
Finkelstein mentions another quote about the 1938 Evian conference that “threathened” to save German Jews outside of Palestine, Dan Kurzman:
”The Jews could have only one destination -Eretz Yisrael. So in June 1938, shortly before Allied representatives met in Evian, France, to seek ways of rescuing Jews, Ben-Gurion frankly voiced his concern to colleagues in the Jewish Agency Executive. He did ‘not know if the conference will open the gates of other countries. . . . But I am afraid [ it ] might cause tremendous harm to Eretz Yisrael and Zionism. . . . Our main task is to reduce the harm, the danger and the disaster . . . and the more we emphasize the terrible distress of the Jewish masses in Germany, Poland and Rumania, the more damage we shall cause.’ So be silent, Ben-Gurion cautioned his comrades. . . . And in the silence . . . Evian failed.”