Irenaeus

But in respect to His greatness, and His wonderful glory, "no man shall see God and live," for the Father is incomprehensible; but in regard to His love, and kindness, and as to His infinite power, even this He grants to those who love Him, that is, to see God, which thing the prophets did also predict. "For those things that are impossible with men, are possible with God." For man does not see God by his own powers; but when He pleases He is seen by men, by whom He wills, and when He wills, and as He wills. …

Against Heresies Book IV ↗

Bede

He said to them: What is impossible with men is possible with God. It is not to be understood in such a way that the greedy and the proud, who are signified by the name of that rich man, will enter the kingdom of heaven with their greed and pride, but it is possible for God that through His word (as we also see has been done and is done daily) they may be converted from the desire for temporal things to the love of eternal things, and from destructive pride to most salutary humility.

On the Gospel of Luke ↗

Bonaventure

Therefore the Lord shows the remedy through the gift of his grace, when he adds: He said to them: The things that are impossible with men, through the power of their own strength, are possible with God, that is, are made possible through his help; which he says because, although it is difficult to despise these temporal things through the force of nature, it is nevertheless made easy through the gift of grace, according to that passage in Song of Songs, last chapter: "If a man should give all the substance of his house for love, he …

Commentary on Luke, Chapter 18 ↗