 Soon after his arrival in London , Jinnah gave up the apprenticeship in order to study law , enraging his father , who had , before his departure , given him enough money to live for three years . The aspiring barrister joined Lincoln 's Inn , later stating that the reason he chose Lincoln 's over the other Inns of Court was that over the main entrance to Lincoln 's Inn were the names of the world 's great lawgivers , including Muhammad . Jinnah 's biographer Stanley Wolpert notes that there is no such inscription , but instead inside is a mural showing Muhammad and other lawgivers , and speculates that Jinnah may have edited the story in his own mind to avoid mentioning a pictorial depiction which would be offensive to many Muslims . Jinnah 's legal education followed the pupillage ( legal apprenticeship ) system , which had been in force there for centuries . To gain knowledge of the law , he followed an established barrister and learned from what he did , as well as from studying <unk> . During this period , he shortened his name to Muhammad Ali Jinnah . 
