In the discussion of practical or moral philosophy, Aquinas had
divided the discipline into three parts: that is, monastic, economic
and political science. The first deals with man's last end or
beatitude; the second with domestic or home actions that are
collaborated for the basic social unit; and third, politics which are
concerned with governing and larger social relations.
Now in Summa Theologiae, Aquinas points out the order of the practical
sciences arrayed in a proper balance through wisdom:
"Of the practical sciences, that one is nobler which is ordained to a
more ultimate end, as political science is nobler than military
science; for the good of the army is directed to the good of the
State. But the purpose of this science, in so far as it is practical,
is eternal beatitude; to which as to an ultimate end the purposes of
every practical science are directed" (Sth I, 1, 4).
Practicarum vero scientiarum illa dignior est, quae ad ulteriorem
finem ordinatur, sicut civilis militari, nam bonum exercitus ad bonum
civitatis ordinatur. Finis autem huius doctrinae inquantum est
practica, est beatitudo aeterna, ad quam sicut ad ultimum finem
ordinantur omnes alii fines scientiarum practicarum. Unde manifestum
est, secundum omnem modum, eam digniorem esse aliis.
The order of these sciences are given through the scale of nobility in
respect of ends. The order is also found in how the various sciences
balance out in respect of the interior parts.
See the link above.
A discussion therefore on thomistic analysis of the practical sciences
pertaining to war and politics, law, or foreign policy, must take the
above principles in mind.
In principle all things of life must be regulated to the final end of
man which is the beatific vision of God in heaven. Thus God's will on
earth is done. Amen.