The Trade Center itself held - and holds - a special place, I think, in the hearts and minds of people in law enforcement - the fact that it did not fall in 1993. Ramzi Yousef's goal was to topple the Twin Towers into each other so that more people died than had died at Hiroshima.

Since Hiroshima and the Holocaust, science no longer holds its pristine place as the highest moral authority. Instead, that role is taken by human rights. It follows that any assault on Jewish life - on Jews or Judaism or the Jewish state - must be cast in the language of human rights.

I have for some time urged that a nuclear abolition summit to mark the effective end of the nuclear era be convened in Hiroshima and Nagasaki on the 70th anniversary of the bombings of those cities, with the participation of national leaders and representatives of global civil society.

Reports in Washington show that our reasoning was just like that of your physicists. With all this information available, at least to privileged persons, I cannot understand why it is generally held in the United States that we completely missed the basic principle of the bomb until after Hiroshima.

I've got a nice collection of paintings - a Basquiat, a black-and-white Warhol that's like a Rorschach test, and I commissioned Takashi Murakami to do a ten-foot joint for me. It's almost like the explosion in Hiroshima with his famous skeleton head. There's a wall above my fireplace reserved for it.

I was profoundly moved to be the first United Nations Secretary-General to attend the Peace Memorial Ceremony in Hiroshima. I also visited Nagasaki. Sadly, we know the terrible humanitarian consequences from the use of even one weapon. As long as such weapons exist, so, too, will the risks of use and proliferation.

Probably the biggest influence on my career was the late John Hersey, who, while he was at 'The New Yorker,' wrote one of the masterpieces of narrative non-fiction, 'Hiroshima.' Hersey was a teacher of mine at Yale, and a friend. He got me to see the possibility of journalism not just as a business but as an art form.

If Mr. Obama could walk across the Peace Bridge in Hiroshima - whose balustrades were designed by the Japanese-American sculptor Isamu Noguchi as a reminder both of his ties to East and West and of what humans do to one another out of hatred - it would be both a real and a symbolic step toward creating a world that knows no fear of nuclear threat.

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