I’m reading Titus 3:8 via @Logos

Commentary on the Holy Scriptures:

Ver. 8. Trustworthy is the word (see on 1 Tim. 1:15). This asseveration refers to the whole course of thought (vers. 4–7).—And this I will that thou strongly affirm (Vulgate: de his vole te confirmare). The Apostle will have Titus lay a very special emphasis upon the great truth of faith brought out in vers. 4–7. Διαβεβαιοῦσθαι, affirm strongly, as in 1 Tim. 1:7.

What is to be aimed at by this, is indicated by the following ἵνα, which shows, once more, that the Apostle desires with such earnestness to have the doctrine of free grace preached, because it is the great means of leading sinners to holiness.—That they who; describing the Cretian Christians in contrast with their previous paganism and idolatry (comp. Acts 16:34).—May take care (comp. chap. 2:10), φροντίζειν (ἅπαξ λεγόμ.): “Thus he wishes them to apply their study and care; and when he says φροντίζωσιν, the Apostle seems elegantly to allude to those empty contemplations which philosophize without fruit or life