This is at least theologically certain and seems to be proximate to faith as it is ascertained by various passages in Sacred Scripture. Cf. 2 Jn. 1:11, Prov. 22:24 etc.
- The principle of Double Effect
I would say either common opinion or theologically certain.
The criteria for recognizing divine revelation (scroll down to the “Criteria of revelation” section)
This is strictly of faith, as defined by the First Vatican Council (1869-1870):
If anyone says that divine revelation cannot be made credible by external signs, and that therefore men and women ought to be moved to faith only by each one’s internal experience or private inspiration: let him be anathema.
- First Vatican Council, Dei Filius, Canon 3, 3
I hope this was helpful,