Speaking at a book release function, Thackeray said Sena is not merely a "political party, but an ideology that is deeply rooted in the common man".
"Shiv Sena has attained this position after a long struggle in last 50 years and whatsoever has happened is before you. We have the history of struggle during this phase but at the same time we are indebted to all Shiv Sainiks who sacrificed everything to live up the expectations of Marathi manoos," he said.
"But I want to (make it) clear that we have been struggling for both these causes during the past 50 years and would be striving to do so in future as well," the Sena chief said.
Shiv Sena, founded by Bal Thackeray in 1966, completed its golden jubilee last month. The book in Marathi, "Suvarn Mahotsavi Shivsena: 50 Vershachi Ghaud-daud" is penned by senior party office-bearers Harshal Pradhan and Vijay Sawant.
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In a veiled dig at its alliance partner BJP, Thackeray said, "whosoever wants to overpower us will never be successful."
"The dream to finish Sena would remain a dream and Sena would continue to flourish," he said.
City Mayor Snehal Ambekar, ministers from the party Subhash Desai, Diwakar Raote and Ravindra Waikar and senior leaders were present on the occasion.