On the eve of summit talks with US President Barack Obama, the Prime Minister urged Pakistan to abjure terrorism and come for talks with India.
Ahead of the first anniversary of the 26/11 Mumbai terror attacks, Dr Singh came down heavily upon the 'selective' approach to terrorism.
"Terrorism poses an existential threat to the civilized world and must be defeated. We should not harbour any illusions that a selective approach to terrorism, tackling it in one place while ignoring it in others, will work," he said.
Speaking on the Indo-Pak ties, the Prime Minister said the UPA government has 'invested heavily' over the past few years in normalising relations with Pakistan.
India seeks a South Asia of peace, friendship and prosperity where its borders will be energised by the flow of people, goods and ideas, Dr Singh said, adding, "For this to happen, Pakistan must make a break with the past, abjure terrorism and come to the table with good faith and sincerity. It is my solemn hope that India and Pakistan can together move forward to write a new chapter in the history of the sub-continent."