God’s supreme truthfulness is per se known — if perceived as God’s word, absolute certainty follows
Per se known: God supremely truthful — cannot lie/false-testify.
If something is certainly/evidently perceived as said by God → absolute certainty follows.
Latin
XXII. Jam autem est quidem per se notum Deum esse summe veracem, ac plane fieri non posse ut mentiatur, & falsum testimonium perhibeat. Adeoque si quis certo & evidenter percipiat aliquid a Deo dici & asseri, inde proculdubio in mente ejus formabitur certitudo summa atque absoluta.