When dealing with crime, he will remember that punishment has two purposes. One is to make bad people better. The other is to remove them from society. Either way, he will focus on the future, not the past. As Plato says, "No wise man punishes someone because they sinned, but so they won't sin again. What's done is done, but what's coming can be prevented." When he wants to make examples of people to show that wickedness fails, he executes them publicly. Not just so they die, but so their deaths will stop others from doing the same thing. You can see how calm and clear-headed a person must be when weighing all this. When someone holds the power of life and death, they must handle it with extreme care. An angry man should never hold the sword of justice.
In all dealing with crime he will remember that the one form of punishment is meant to make bad men better, and the other to put them out of the way. In either case he will look to the future, not to the past: for, as Plato says, “no wise man punishes any one because he has sinned, but that he may sin no more: for what is past cannot be recalled, but what is to come may be checked.” Those, too, whom he wishes to make examples of the ill success of wickedness, he executes publicly, not merely in order that they themselves may die, but that by dying they may deter others from doing likewise. You see how free from any mental disturbance a man ought to be who has to weigh and consider all this, when he deals with a matter which ought to be handled with the utmost care, I mean, the power of life and death. The sword of justice is ill-placed in the hands of an angry man.