Theophylact of Ohrid

Having said that the love of God is poured out in us through the Spirit, Whom we have in ourselves as a gift from God, he further shows the greatness of this love from the fact that Christ died for us while we were weak, that is, sinners, and what is even worse, for the ungodly, although hardly anyone would die even for a righteous person. So then, this is a superabundance of love—to die for sinners and the ungodly. The phrase "in due time" means at the fitting and foreordained time, for the Lord died when the fitting time had come.

Commentary on Romans ↗

Irenaeus

But again, showing that Christ did suffer, and was Himself the Son of God, who died for us, and redeemed us with His blood at the time appointed beforehand, he says: "For how is it, that Christ, when we were yet without strength, in due time died for the ungodly? But God commendeth His love towards us, in that, while we were yet sinners, Christ died for us. Much more, then, being now justified by His blood, we shall be saved from wrath through Him. …

Against Heresies Book III ↗

Thomas Aquinas

After disclosing that hope is firm, because it is a gift of the Holy Spirit, the Apostle now traces its firmness to the death of Christ. First, he asks a question; second, a difficulty arises in answering it, at for scarce for a just man; third, he answers the question, at but God commends his charity. First, therefore, he says: it has been stated that hope does not disappoint. …

Commentary on Romans ↗