On several occasions St. Thomas makes use of the phrase praeambula fidei in speaking of those truths about God which are accessible to unaided human reason. It is well known that Thomas thought that pagan philosophers, notably Aristotle, had succeeded in proving that God exists and had come to knowledge of many of His attributes. These are the matters the phrase “preambles of faith” is meant to cover, and that is why discussion of it can aspire to cast some light on the notion of Natural Theology, the culminating concern of metaphysics and thus of philosophy.
"St. Thomas and the Preambles of Faith,"
University of Dayton Review: Vol. 12:
1, Article 15.
Available at: https://ecommons.udayton.edu/udr/vol12/iss1/15