The sun will set this evening on more than 45 years of the United Kingdom's membership of the European Union.
For us, as presidents of the three main EU institutions, today is a day of reflection and mixed emotions - as it will be for so many people.
Our thoughts are with all of those who have helped to make the European Union what it is today. Those who are concerned about their future or disappointed to see the UK leave. Those British members of our institutions who helped shape policies that made lives better for millions of Europeans.
We will think of the UK and its people, their creativity, ingenuity, culture, and traditions, that have been a vital part of our EU tapestry.
These emotions reflect our fondness for the United Kingdom - something which goes far beyond membership of our Union. We have always deeply regretted the UK's decision to leave - but we have always fully respected it.
The agreement we reached is fair for both sides and ensures that millions of EU and UK citizens will continue to have their rights protected.
We also need to look to the future and build a new partnership between enduring friends. Together, our three institutions intend to do everything we can to make it a success.
How close that partnership will be depends on decisions that are still to be taken. Because every choice has a consequence.
Without the free movement of people, there can be no free movement of capital, goods and services. Without a level playing field on environment, labour, taxation and state aid, there cannot be the highest quality access to the single market.
Without being a member, you cannot retain the benefits of membership.
We will have to loosen some of the threads carefully stitched together between the EU and the UK over five decades. We must weave together a new way forward as allies, partners and friends.
The UK will cease to be an EU member but remain part of Europe. Our shared geography, history and ties in so many areas inevitably bind us and make us natural allies. We will continue to work together on foreign affairs, security and defence. But we will do it in different ways.
Tomorrow will also mark a new dawn for Europe. The last few years have brought us closer together - as nations, as institutions and as people.
They have reminded us all that the European Union is more than a market or economic power but also stands for shared values that we all defend.
The EU member states will continue to join forces and build a common future. In an age of great power competition and turbulent geopolitics, size matters.
No country alone can hold back the tide of climate change, find the solutions to the digital future.
But together, the European Union can. We can because we have the largest internal market in the world. We can because we are the top trading partner for 80 countries. We can because we are a union of vibrant democracies.
We can because our peoples are determined to promote European interests and values on the world stage. We can because EU member states will leverage their considerable, collective economic power in discussions with allies and partners - the United States, Africa, China and India.
We have a common vision of where we want to go and a commitment to be ambitious on the defining issues of our times.
As set out in the European Green Deal, we want to be the first climate-neutral continent by 2050, creating jobs and opportunities for people in the process.
We want to take the lead on the next generation of digital technologies and we want a just transition so that we can support the people most affected by change.
We believe only the European Union can do this. But we can only do it together: people, nations, institutions. That work continues as soon as the sun rises tomorrow.
Ursula von der Leyen is the EU Commission President, Charles Michel is the EU Council President, and David Sassoli is European Parliament President.