111 The service which moral theologians are called to provide at the present time is of the utmost importance, not only for the Church's life and mission, but also for human society and culture. Moral theologians have the task, in close and vital connection with biblical and dogmatic theology, to highlight through their scientific reflection "that dynamic aspect which will elicit the response that man must give to the divine call which comes in the process of his growth in love, within a community of salvation. In this way, moral theology will acquire an inner spiritual dimension in response to the need to develop fully the imago Dei present in man, and in response to the laws of spiritual development described by Christian ascetical and mystical theology". Certainly moral theology and its teaching are meeting with particular difficulty today. Because the Church's morality necessarily involves a normative dimension, moral theology cannot be reduced to a body of knowledge worked out purely in the context of the so-called behavioural sciences. The latter are concerned with the phenomenon of morality as a historical and social fact; moral theology, however, while needing to make use of the behavioural and natural sciences, does not rely on the results of formal empirical observation or phenomenological understanding alone. Indeed, the relevance of the behavioural sciences for moral theology must always be measured against the primordial question: What is good or evil? What must be done to have eternal life?
Source: Veritatis Splendor (Vatican.va)