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Objection 1: It seems that sacred doctrine is a practical science;
for a practical science is that which ends in action according to the
Philosopher (Metaph. ii). But sacred doctrine is ordained to
action: "Be ye doers of the word, and not hearers only" (James
1:22). Therefore sacred doctrine is a practical science.
Objection 2: Further, sacred doctrine is divided into the Old and
the New Law. But law implies a moral science which is a practical
science. Therefore sacred doctrine is a practical science.
On the contrary, Every practical science is concerned with human
operations; as moral science is concerned with human acts, and
architecture with buildings. But sacred doctrine is chiefly concerned
with God, whose handiwork is especially man. Therefore it is not a
practical but a speculative science.
I answer that, Sacred doctrine, being one, extends to things which
belong to different philosophical sciences because it considers in each
the same formal aspect, namely, so far as they can be known through
divine revelation. Hence, although among the philosophical sciences
one is speculative and another practical, nevertheless sacred doctrine
includes both; as God, by one and the same science, knows both
Himself and His works. Still, it is speculative rather than
practical because it is more concerned with divine things than with
human acts; though it does treat even of these latter, inasmuch as man
is ordained by them to the perfect knowledge of God in which consists
eternal bliss. This is a sufficient answer to the Objections.
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