In this first session, Fr Crean considers what is meant by divine law, and why it is necessary. We shall see that it forms a part of God’s revelation to mankind, and God gave different laws to mankind before the Fall and at the time of the patriarchs, culminating in the “old law” given to Moses for the people of Israel. We shall look at the Mosaic law, in more detail, and see how it contained moral, ceremonial and legislative precepts.