Analysis of information sources in references of the Wikipedia article "Essentials of Hindutva" in English language version.
It was during his stay in Ratnagiri prison, in 1922, that he wrote his influential book Hindutva ("Hindu-ness"). The text was smuggled out and published under a pseudonym. The highlight of the book was his definition of the term Hindu: "one for whom India is both Fatherland and Holyland".