He said the efforts to bring back black money stashed abroad are on the "right track" even as he acknowledged that there was no correct estimate about how much money is kept illegally in foreign countries.
In an address to the nation over radio, he said that bringing back black money from outside the country is an "article of faith" for him and nothing will be lacking in his efforts to do so.
It had maintained that disclosure of details of account holders would hamper efforts to bring back black money.
The government beat a hasty retreat after the Supreme Court ordered it to disclose the names of account holders in HSBC Geneva which amounted to 627 in number. The government also came under attack from opposition parties that it was going back on its election promise to unearth and bring back black money stashed abroad.
"As far as black money is concerned. You should have faith on this 'pradhan sevak'. For me, it is an article of faith. Every penny of the money of poor people in this country, which has gone out, should return. This is my commitment," Modi said in 'Mann ki Baat' programme on All India Radio.
"There may be differences over the approach and procedures, which is natural in a democracy. But as far as my understanding goes and on the basis of information I have, I can say we are on the right track," he said.