This or a variation on it is often quoted as a "Prabhupada said. " But did Srila Prabhupada actually say this? The closest quote I found was:

Over the past ten years I have given the framework and now we have become more than the British Empire. Even the British Empire was not as expansive as we. They had only a portion of the world, and we have not completed expanding. We must expand more and more unlimitedly.

>>> Ref. VedaBase => Letter to: All Governing Board Commissioners  — Honolulu 19 May, 1976