For first, when Pompey made severe laws for punishing and laying great fines on those who had corrupted the people with gifts, Cato advised him to let alone what was already passed, and to provide for the future; for if he should look up past misdemeanors, it would be difficult to know where to stop; and if he would ordain new penalties, it would be unreasonable to punish men by a law, which at that time they had not the opportunity of breaking.