"Humanity is taking a long time to understand... the true problems that beset it today. But unless it understands these problems, there will be no hope for the future of the world. The tensions existing in this discrepancy of living standards have within them the seeds of a third world war. That war would be nuclear and would destroy all life on the planet."
January 1, 1970
https://en.wikiquote.org/wiki/The_World_Teacher_for_All_Humanity