Sinha was always interested in self-study and his ideas and speeches were noted for their wisdom. He was a staunch opponent of castes and defended the oppressed. Impressed by his courage, in 1940 Gandhi described him as "the first Satyagrahi" of Bihar while A.N. Sinha was the second. He was jailed for nine months (22 November 1940 – 26 August 1941). When the Quit India movement started in 1942, he was arrested on 10 August. He was released in 1944 from Hazaribagh jail after he became seriously ill. In the same year his wife died at Prince of Wales Medical College.