Bl. Johann Posewitz on theological conclusions being of faith [de fide]:
“Suárez (in the cited place) and the Walenburchs (in Augustinian Method, appendix, page 147) concede that a theological conclusion, which was previously contained only virtually in revealed things, after it is defined by the Church, is formally and properly a matter of faith, not only mediately but immediately. But if such a conclusion is the word of God and a matter of faith, it must be revealed. See the Walenburchs’ Examen, page 452. But it is not expressly revealed. Therefore, it is the word of God and a matter of faith because it is revealed mediately.
Suárez says that such a conclusion is revealed through the Church. But this is without reason, for the Walenburchs themselves, in Examen of the Three Principles of Faith, teach: ‘The Catholic Church has no word of God which God revealed after the times of the Apostles.’” — Theologia Scholastica (1.21)