The abstract noun "justice" can be translated using the phrase "what is just." Alternate translation: "he loves doing what is just" (See: [[rc://en/ta/man/jit/figs-abstractnouns]])
The abstract noun "fairness" is a metonym for the laws that are fair. Alternate translation: "The laws you have established are fair" (See: [[rc://en/ta/man/jit/figs-abstractnouns]] and [[rc://en/ta/man/jit/figs-metonymy]])