Modi's remarks came at the BJP Parliamentary Party meeting and were an apparent reference to a number of state elections, including the upcoming Karnataka polls, followed by the Lok Sabha elections next year.
The prime minister was greeted with the slogan, 'Jeet hamari jari hai, ab Karnataka ki bari hai' (Our winning run continues, now it's Karnataka's turn), leaders present in the meeting said.
"..But each state and election is important," Modi said, while terming the BJP's performance in Tripura as "historic".
"Tripura was considered a bastion of Marxism for the last 25 years. This is an ideological victory. It has changed the mood in the party and the nation," Modi said.
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To underline the significance of the win in Tripura, Modi said the party's win in one assembly seat in Kerala polls had energised the cadres.
"There is hope and expectation in the country and the party needs to work hard to maintain its winning streak," Parliamentary Affairs Minister Ananth Kumar quoted Modi as saying.
Targeting the Left, Modi said its politics was underpinned by violence and hate and that people have rejected it everywhere.
"It is finished across the world and is on the verge of oblivion in India as it is now in power only in Kerala," Modi said.
The prime minister said that all the three states -- Tripura, Meghalaya and Nagaland -- are important and that the central government will give priority to their development.
"..but this time the focus has been at its performance in the three states," he said.
All BJP MPs were distributed 'angavastram' brought by the party from these states and offered 'prasad' from Assam's famous 'Kamakhya' temple, which is believed by the faithful to be protector of the North-East region.
A presentation on Union Budget was also made in the meeting during which several infographics were presented to highlight the state of economy in 2014 and its progress since then under the Modi government.
An alliance of several parties, including the BJP, was sworn-in in Meghalaya today. Modi extended his greetings to new Chief Minister Conrad Sangma.
The party is set to be part of a new government in Nagaland as a junior partner. It has won a majority on its own in Tripura.
Modi also paid tribute to the nine BJP workers who were killed in alleged political violence - blamed on the Left by the party - in Tripura during the run-up to the state polls.