 He himself wrote on social and cultural history, and painstakingly unravelled the history of Muslim mystics for some of whom he came to cherish an almost personal affection.In the forties, his interest in Marxism heightened and in 1952 he presented, in a remarkable piece, his introduction to a reprint of volume II of Elliot and Dowson's "The History of India, as Told by Its Own Historians", which was an interpretation of early medieval India deeply influenced by Marxist ideas.He visited Paris to represent his country at the UN General Assembly, followed by a trip to Peking (now Beijing) in 1952 on the first goodwill mission from India to the People's Republic of China.