And we cannot promise to put everything right straight away.

BBC: Labour conference: Ed Balls calls for stamp duty break

But we cannot realize that promise if we allow the hum of our prosperity to lull us into complacency.

CNN: Prepared Text of Clinton's State of the Union speech

They form the bedrock of the American promise, and we cannot fully realize one without realizing them all.

WHITEHOUSE: Presidential Proclamation -- Bill of Rights Day, 2012

We cannot afford to make the identical promise to future generations.

FORBES: U.S. Treasury to President Obama: Medicare's Current Policy 'Is Unsustainable'

And if we start rowing in the same direction, I promise you, there is nothing that we cannot achieve.

WHITEHOUSE: Out-Educating the Competition

History is made when men and women decide that there is a greater risk in accepting a situation that we cannot bear than in steeling our spine and embracing the promise of change.

WHITEHOUSE: President Obama Signs Health Reform Into Law

We cannot cede to other nations the technology that will power new jobs and new industries, we must claim its promise.

BBC: Obama inauguration: Full text