He sought to woo minorities by highlighting the decisions taken by his government for their benefit, including increased share in jobs, loans and welfare schemes besides programmes to address social and economic backwardness of Muslims.
Addressing a conference of state minority commissions here, Singh said India's strength lies in unity and warned against divisive forces.
"In most parts of country the relationship between majority and minority communities is harmonious, although there have been instances where this has been put to severe test, especially of late," he said in an apparent reference to recent riots in Muzaffarnagar in Uttar Pradesh.
In what could be seen as a reference to BJP and its prime ministerial candidate Modi, he said, "For India as a country, secularism has been a way of life practised over centuries. We should be cautious of people who work against India's secular thought by attempting to redefine secularism...
"We should be vigilant against forces that seek to exploit our diversity in religion, language and culture to divide out society."