He was always concerned about the thoughts, ideas and condition of Muslims everywhere, but specially Indian Muslims who were under British Rule and threatened by the Brahman ruling population. Iqbal believed strongly in Sir Syed Ahmed Khan's 'Two Nation theory' that Muslims and Hindus were two separate nations and should be allowed to live separately. He put forward this idea again in his famous Allahabad Address to the Muslim League, in 1930, and preached this in his poems and lectures. Allama's words and ideas inspired many Muslims, some of whom became leaders of the Muslim League. He was very popular amongst the Muslim masses too. Being such an influential poet for the Muslims of India, Iqbal also saw the Iqbal Day being celebrated during his lifetime across the sub-continent.