It is tragic that so few young people in Western democracies vote. They have forgotten that their ancestors fought for the right to choose and change their leaders. They don't realise that their votes are more important than their tweets or Facebook posts.

Nuclear terrorism is still often treated as science fiction. I wish it were. But unfortunately we live in a world of excess hazardous materials and abundant technological know-how, in which some terrorists clearly state their intention to inflict catastrophic casualties. Were such an attack to occur, it would not only cause widespread death and destruction, but would stagger the world economy... [creating] a second death toll throughout the developing world.

His Holiness brings a wealth of experience to this exalted office. The United Nations and the Holy See share a strong commitment to peace, social justice, human dignity, religious freedom and mutual respect among the world's religions.

Does anyone seriously contend that any nation can fend for itself?

Tolerance, inter-cultural dialogue and respect for diversity are more essential than ever in a world where peoples are becoming more and more closely interconnected.

Applaud us when we prevail, correct us when we fail; but, above all, do not let this indispensable, irreplaceable institution wither, languish or perish as a result of Member States' indifference, inattention or financial starvation.

It is true that the principle of national citizenship, associated with rights, and the control of a country's borders are two key aspects of modern 'sovereign' nation states as they emerged in the Westphalian order. But there has been much progress since 1648.