Dicsuss john rawls theory of justice?

John Rawls, an important political thinker, has given a theory of justice to achieve a just state. he puts all individuals behind the 'veil of ignorance'. 'veil of ignorance' means that individuals are put in a position where they do not know what is their status, wealth, class, ability , talent etc. so these individuals will choose privileges which will affect them once they come out of veil of ignorance. Rawls said that these individuals are rational and will choose privileges which will help them in developing their fuller personality. so they will first choose liberty. Because if an individual has liberty then he/she will be able to achieve anything by his/her hard work. second they will want is equality of oppurtunity. that means all individuals should get the equal oppurtunity. they should not be discriminated on the basis of their caste, region, gender and religion.   
And third, they will demand is difference principle. It means that if any individual, after veil of ignorance, comes out  is disabled or unfortunate, then society should help that least advantaged person. 
This Rawl's theory of justice where rationality rather than moral thinking can lead us to have a fair and just society.