I have always believed that on important issues, the leaders must lead. Where the leaders fail to lead, and people are really concerned about it, the people will take the lead and make the leaders follow.

I urge you to celebrate the extraordinary courage and contributions of refugees past and present.

Fierce national competition over water resources has prompted fears that water issues contain the seeds of violent conflict.

Above all else, we need a reaffirmation of political commitment at the highest levels to reducing the dangers that arise both from existing nuclear weapons and from further proliferation.

Without a dream you'll not get anywhere.

Sometimes in peacekeeping operations you show force in order not to use force - people realise that there's a pushback and there's a solid force there that's not going to be pushed around, that sometimes helps.

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.