The general principle latent in these diverse applications of the idea of justice is that individuals are entitled in respect of each other to a certain relative position of equality or inequality. This is something to be respected in the vicissitudes of social life when burdens or benefits fall to be distributed; it is also something to be restored when it is disturbed. Hence justice is traditionally thought of as maintaining or restoring a balance or proportion, and its leading precept is often formulated as ‘Treat like cases alike’; though we need to add to the latter ‘and treat different cases differently’.

H. L. A Hart, The Concept of Law, loc. 418