Today, hundreds of millions dwell in freedom, from the Baltic to the Adriatic, from the Western Approaches to the Aegean. And while we must never take this for granted, the first purpose of the European Union - to secure peace - has been achieved and we should pay tribute to all those in the EU, alongside Nato, who made that happen.
I don't just want a better deal for Britain. I want a better deal for Europe too. So I speak as British prime minister with a positive vision for the future of the European Union. A future in which Britain wants, and should want, to play a committed and active part.
We have the character of an island nation: independent, forthright, passionate in defence of our sovereignty. We can no more change this British sensibility than we can drain the English Channel. And because of this sensibility, we come to the European Union with a frame of mind that is more practical than emotional.
I believe something very deeply. That Britain's national interest is best served in a flexible, adaptable and open European Union and that such a European Union is best with Britain in it.
The biggest danger to the European Union comes not from those who advocate change, but from those who denounce new thinking as heresy. In its long history, Europe has experience [with] heretics who turned out to have a point.
Because with courage and conviction I believe we can deliver a more flexible, adaptable and open European Union in which the interests and ambitions of all its members can be met.
It [European Union] has kept the peace in Europe. Countries used to fight and now they talk. We should be attached to that.
I'll be explaining that Britain will be leaving the European Union, but I want that process to be as constructive as possible. And I hope the outcome can be as constructive as possible because of course while we're leaving the European Union, we mustn't be turning our backs on Europe.
Today the main, over-riding purpose of the European Union is different: not to win peace, but to secure prosperity.
After the Berlin Wall came down I visited that city and I will never forget it. The abandoned checkpoints. The sense of excitement about the future. The knowledge that a great continent was coming together. Healing those wounds of our history is the central story of the European Union.
I want the European Union to be a success. And I want a relationship between Britain and the EU that keeps us in it.
At the core of the European Union must be, as it is now, the single market. Britain is at the heart of that Single Market, and must remain so.
If we left the European Union, it would be a one-way ticket, not a return. So we will have time for a proper, reasoned debate. At the end of that debate you, the British people, will decide.
Countries are different. They make different choices. We cannot harmonise everything. For example, it is neither right nor necessary to claim that the integrity of the single market, or full membership of the European Union requires the working hours of British hospital doctors to be set in Brussels irrespective of the views of British parliamentarians and practitioners.
I am not a British isolationist. I don't just want a better deal for Britain. I want a better deal for Europe too.
It does not seem to me that the steps which would be needed to make Britain - and others - more comfortable in their relationship in the European Union are inherently so outlandish or unreasonable.
The European Union that emerges from the Eurozone crisis is going to be a very different body. It will be transformed perhaps beyond recognition by the measures needed to save the Eurozone.
An EU without Britain, without 1 of Europe's strongest powers, a country which in many ways invented the single market, and which brings real heft to Europe's influence on the world stage which plays by the rules and which is a force for liberal economic reform would be a very different kind of European Union.
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