There are in existence two distinct ideas of justice. We say that an award is unjust when it penalizes the innocent, rewards the guilty, or when, in general, it fails to be meted out in exact proportion to the merit or guilt in question. On the other hand, we say that a division is unjust when it favors some at the expense of others. In this second adaptation of the term, the idea of justice implies only the idea of equality. In the first acceptation of the term, the notion of justice is inseparable from that of the reward and punishment, and is defined by the correlation between acts and their retribution.

Ch. 3 Cooperation and the Idea of Justice - The Moral Judgment of the Child (1932)