India Wins Freedom - pg. 215

As soon as Sardar Patel had been convinced, Lord Mountbatten turned his attention to Jawaharlal. Jawaharlal was not at first at all willing and reacted violently against the very idea of partition, but Lord Mountbatten persisted till step by step Jawaharlal's opposition was worn down. Within a month of Lord Mountbatten's arrival in India, Jawaharlal, the firm opponent of partition, had become, if not a supporter, at least acquiescent towards the idea.
I have often wondered how Jawaharlal was won over by Lord Mountbatten. Jawaharlal is a man of principle, but he is also impulsive and amenable to personal influence. The arguments of Sardar Patel must have had some effect, but could not have been decisive. Jawaharlal was also greatly impressed by Lord Mountbatten, but perhaps even greater was the influence of Lady Mountbatten. She is not only extremely intelligent, but had a most attractive and friendly temperament. She admired her husband greatly and in many cases tried to interpret his thought to those who would not at first agree with him.