Romans 1:18

Verse 18. For. This word denotes that the apostle is about to give a reason for what he had just said. This verse commences the argument of the epistle, an argument designed to establish the proposition advanced in Ro 1:17. The proposition is, that God's plan of justification is revealed in the gospel. To show this, it was necessary to show that all other plans had failed; and that there was need of some new plan or scheme to save men. To this he devotes this and the two following chapters. The design of this argument is to show that men were sinners. And in order to make this out, it was necessary to show that they were under law. This was clear in regard to the Jews.