"Our new vision for the country involves achieving the twin objectives of sustainable development and reconciliation. A fundamental requirement in this context is dealing with the past honesty and building a modern Sri Lankan nation," Sirisena told the UN General Assembly.
He said that in the wake of years of conflict, his Government is now moving forward with a process of "truth seeking, justice, reparation and non-recurrence."
Rising to 21st century challenges will require Sri Lanka to adopt a new social, economic and political approach, and, in that regard, he said that reconciliation must receive "priority attention".
Sirisena said Sri Lanka has suffered from conflict and while such turmoil could bring destruction to a society, there are also many lessons that could be learned during and after a conflict.
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"All forms of war and terrorism are a disgrace to humanity," he continued, saying that the challenge of the modern era is to find ways and means to "defeat such brutality against humanity."
"Sri Lanka succeeded in eliminating terrorism, which continues to throttle other developing countries in many regions - from Asia and Africa to Latin America," he said.