"It is said politics is dirty. No, it is not. If politics was dirty, Mahatma Gandhi would never have ventured into this," Modi said at a function to launch the BJP's first membership drive post its emphatic win in the 2014 general elections.
"BJP (Bharatiya Janata Party) should also come across as a diverse party. People from all strata of society should feel that we have a representative in this vase of flowers," he said.
"The poor and illiterate should also feel that we are a part of this party. The organisation should be expanded in such a manner that it is representative of all and can fulfill the dreams of all," he said.
The prime minister added: "People from all sections of society should feel they have a representative in BJP. Our country is full of diversities, BJP should also be visible as a party with diversities."
The party's new membership drive aims at increasing its strength to four times the current strength.
Modi said that the membership drive should serve as an example globally.
The prime minister became the first member of the BJP in this membership drive, which will last till March 31, 2015
"By giving me this opportunity, today the BJP has honoured me. To be a member of such a party is also a matter of pride," he said.
Modi said the BJP is one of the world's most important organisations and could even be a subject of study.
"The BJP is one of the most important organisations in the world. Yet we have never positioned it like that. To be a member of BJP is to live the disciplined life it demands... every member of BJP is a representative of the people," he added.
Modi said that the country's politics was changing. "Era of mass agitation for politics seems over. Now people expect parties to play significant roles in public life."
Party president Amit Shah said the present membership drive was important as it was being held after the BJP got a full majority in this general election. The party also formed its first-ever governments on its own in Haryana and Maharashtra following the assembly elections in the states.