Peace is an ongoing process. It begins with the first step and it does not end. We, all of us alive today, are the gatekeepers of the future. The world we bequeath to our children and grandchildren will depend upon our success in building a more peaceful and decent world.

Sooner or later there will be a nuclear 9/11 [by Islamic terrorists] in an American city or that of a US ally... A terrorist nuclear attack against an American city could take many forms. A worst case scenario would be the detonation of a nuclear device within a city. Depending upon the size and sophistication of the weapon, it could kill hundreds of thousands or even millions of people.

That the man in question should be Donald Trump, with all his personal flaws, challenges the United States and the world as never before in human history.

We all have choices. We can build walls or we can build bridges. We can give our talents to creating weapons of annihilation, as so many scientists have done, or we can work to find solutions to humanities greatest problems. Our orientation is found not only in our acts, but also in the policies we support or oppose.

[Donald Trump] said on MSNBC's Morning Joe program, "My primary consultant is myself." While this may make consensus easy, the range of perspective is dangerously narrow.

That so much power over the U.S. nuclear arsenal is placed in the hands of one man - any man - bodes ill for humanity, while completely undermining the war power granted to Congress in the U.S. constitution.

Each of us by our daily acts of peace and our commitment to building a better world can inspire others and help create a groundswell for peace too powerful to be turned aside.