The President, Mrs McAleese, in her St Patrick's Day message, said this was a particularly special time for Ireland.
"Beannachtaí na Féile Pádraig ar chlann mhór domhanda na nGael, sa bhaile agus ar fud na cruinne, ar an lá náisiúnta ceiliúrtha seo.
"A Happy St Patrick's Day to Ireland's sons and daughters and indeed to our adopted brothers and sisters throughout the world.
"This St Patrick's Day is a particularly special time for Ireland. Today our national day is celebrated during Ireland's presidency of the European Union, when the European family of nations is about to adopt many new members.
"These are times of great hope for the nations of Europe and this great project will surely be a beacon to the other nations of the world. We welcome those new members and look forward to a future of friendship and fellowship with them and their peoples. St Patrick himself was, of course, a great European whose vision was not bounded by narrow horizons.
"Around the world, on this day, we come together to celebrate the music and song, the wit and humour, the friendship and fellowship that is our heritage and our pride.
"Many friends will join in the festivities here in Ireland and abroad, and will carry with them the richness of fluent and open friendship that signifies our Irishness.
"Our greatest gift as a people is our openness to new experiences and genuine curiosity about other cultures while we continue to inspire other nations with our legacy of resilience, versatility, and enthusiasm for whatever the future holds.
"That great capacity to adapt underlies much of our economic and cultural successes over the past decade.
"These shared gifts have sustained and encouraged us through every challenge we have faced throughout history," the President added.