Fides quaerens intellectum. The rational reflection on the presence of God in human activity doesn't give us proofs for moral activity. We cannot prove in a scientifically modern way the truth of the Mystical Body. So we have as the point of departure revelation, which has as its point of departure the Logos, the spoken word, which can be heard and reflected upon. We can study the presence of God in human actions and test rational conclusions on the basis of revelation.
Moral theology can demonstrate the action of grace on human activity.
We look at the saints. Moral theology also studies how the divine activity can be curbed by sin. It will describe the liberating divine fecundity in various human moral states. But moral theology is always to offer enunciation rather than moralization. Through the articulation of the principles of morality, the divine fecundity will become known.