On his final full day in office, President Obama published a farewell letter to the nation on Facebook. "I've seen you, the American people, in all your decency, determination, good humor, and kindness. And in your daily acts of citizenship, I've seen our future unfolding."

President Obama’s full letter to the American people:

It’s a long-standing tradition for the sitting president of the United States to leave a parting letter in the Oval Office for the American elected to take his or her place. It’s a letter meant to share what we know, what we’ve learned, and what small wisdom may help our successor bear the great responsibility that comes with the highest office in our land, and the leadership of the free world.

But before I leave my note for our 45th president, I wanted to say one final thank you for the honor of serving as your 44th. Because all that I’ve learned in my time in office, I’ve learned from you. You made me a better President, and you made me a better man.

Throughout these eight years, you have been the source of goodness, resilience, and hope from which I’ve pulled strength. I’ve seen neighbors and communities take care of each other during the worst economic crisis of our lifetimes. I have mourned with grieving families searching for answers – and found grace in a Charleston church.

I’ve taken heart from the hope of young graduates and our newest military officers. I’ve seen our scientists help a paralyzed man regain his sense of touch, and wounded warriors once given up for dead walk again. I’ve seen Americans whose lives have been saved because they finally have access to medical care, and families whose lives have been changed because their marriages are recognized as equal to our own. I’ve seen the youngest of children remind us through their actions and through their generosity of our obligations to care for refugees, or work for peace, and, above all, to look out for each other.

I’ve seen you, the American people, in all your decency, determination, good humor, and kindness. And in your daily acts of citizenship, I’ve seen our future unfolding.

All of us, regardless of party, should throw ourselves into that work – the joyous work of citizenship. Not just when there’s an election, not just when our own narrow interest is at stake, but over the full span of a lifetime.

I’ll be right there with you every step of the way.

And when the arc of progress seems slow, remember: America is not the project of any one person. The single most powerful word in our democracy is the word ‘We.’ ‘We the People.’ ‘We shall overcome.’

Yes, we can.

As much as I am not looking forward to the end of Barack Obama’s presidency, and it is hard to overstate how much I am not looking forward to it, I am simultaneously looking forward to what this president will do next.

Much hay has been made by his opponents, for many years, about his having been a community organizer. But people who know how to organize communities are as important as they have ever been, and possibly more than ever.

President Bill Clinton has spoken many times about how, as powerful as the presidency is, there are things people who have held the office can do that they could never have done while in office, given its many constraints. And I am eager to see what Obama will do with that freedom.

To “keep in touch” with the President, go here to sign up.