The Summa Theologica of Roman Catholic Dominican Saint Thomas Aquinas.

You are welcome to join us for a study of The Summa Theologica.

"Whoso turns his attention to the bitter strifes of these days and seeks a reason for the troubles that vex public and private life must come to the conclusion that a fruitful cause of the evils which now afflict, as well as those which threaten, us lies in this: that false conclusions concerning divine and human things, which originated in the schools of philosophy, have now crept into all the orders of the State, and have been accepted by the common consent of the masses. For, since it is in the very nature of man to follow the guide of reason in his actions, if his intellect sins at all his will soon follows; and thus it happens that false opinions, whose seat is in the understanding, influence human actions and pervert them. Whereas, on the other hand, if men be of sound mind and take their stand on true and solid principles, there will result a vast amount of benefits for the public and private good."
(Pope Leo XIII, Aeterni Patris, encylical letter on St Thomas Aquinas
and the restoration of philosopy)

Can. 252§3 Lectures are to be given in dogmatic theology, based
always on the written word of God and on sacred Tradition; through
them the students are to learn to penetrate more deeply into
the mysteries of salvation, with St. Thomas in particular as their teacher.

Summa Theologia, Summa Theologiae
roncriss 2006.