Prime Minister David Cameron has launched a defence of the United Kingdom as his government prepares to put the "facts" about Scottish independence to the public.
"Britain is admired around the world as a source of prosperity, power and security," he said.
"Those glorious Olympics last summer reminded us just what we were capable of when we pull together: Scottish, English, Welsh, Northern Irish, all in the same boat - sometimes literally.
"If you told many people watching those Olympics around the world that we were going to erect barriers between our people, they'd probably be baffled. Put simply: Britain works. Britain works well. Why break it?"
Addressing matters of the "heart and head", Mr Cameron spoke out one day before the British Government publishes the first in a series of analysis papers about Scotland's role in the union. It comes one week after the Scottish Government published a "road map" from the referendum next year to full statehood in early 2016.
Mr Cameron said Britain has built up "world-renowned" institutions such as the NHS and BBC, and "fought for freedom" in two world wars, leaving "unbreakable bonds".
He said: "But the case for the UK is about head as well as heart - our future as well as our past.
"I have no time for those who say there is no way Scotland could go it alone. I know first-hand the contribution Scotland and Scots make to Britain's success - so for me there's no question about whether Scotland could be an independent nation.
"The real question is whether it should - whether Scotland is stronger, safer, richer and fairer within our United Kingdom or outside it. And here, I believe, the answer is clear."