Here Aquinas is making the case that laws must be reasonable. Aquinas also makes the point that laws must be made by one or more persons who have the wellbeing of the community in mind. Laws are made for everyone and belong to everyone. The promulgation of law Here Aquinas is making the case that laws must be written and public.
People have to know what it is.
Of the Natural Law 1. The foundation for the natural law has been instilled in a man's heart and is discoverable by reason. Natural laws are not simply learned habits based on a culture. They form the basis of or principles for good habits. The natural law is our human understanding of God's law.