The speeches were given in 1985, 1987, and 1988.
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"… when you stop to think that we're all God's children, wherever we may live in the world, I couldn't help but say to him, just think how easy his task and mine might be in these meetings that we held if suddenly there was a threat to this world from some other species from another planet outside in the universe. We'd forget all the little local differences that we have between our countries and we would find out once and for all that we really are all human beings here on this earth together…"
Remarks to the Students and Faculty at Fallston High School in Fallston, Maryland, on December 4, 1985
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"In our obsession with antagonisms of the moment, we often forget how much unites all the members of humanity. Perhaps we need some outside, universal threat to make us recognize this common bond. I occasionally think how quickly our differences worldwide would vanish if we were facing an alien threat from outside this world."
Address to the 42d Session of the United Nations General Assembly in New York, New York, on September 21, 1987
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"But I've often wondered, What if all of us in the world discovered that we were threatened by a power from outer space – from another planet. Wouldn't we all of a sudden find that we didn't have any differences between us at all – we were all human beings, citizens of the world – and wouldn't we come together to fight that particular threat."
Remarks and a Question-and-Answer Session With Members of the National Strategy Forum in Chicago, Illinois, on May 4, 1988
https://www.youtube.com/watch?v=uD2186Yh0Uc