The Irish President said he will be "affirming and celebrating" the values Britain and Ireland share on his state visit to the UK this week.
Ahead of his state visit, Professor Higgins said:
This historic visit reminds us that while the passage of time can change the contours of political maps and perhaps even community allegiances, it does not alter the challenges and possibilities of our shared humanity with its innate decency and dignity.
The values which unite the British and Irish people are ones I look forward to affirming and celebrating during the forthcoming State Visit to the United Kingdom.
Michael Higgins is the first Irish President to make a state visit to the UK, ending the day with a state banquet at Windsor Castle.
Today's historic visit is a symbolic ending to the painful separation of British and Irish states, but 3000 unsolved murders remain.