Romans 1:19-20
“For what can be known about God is plain to them, because God has shown it to them. For his invisible attributes, namely, his eternal power and divine nature, have been clearly perceived, ever since the creation of the world, in the things that have been made. So they are without excuse.”
Paul says that there is something intelligible about God in creation that is universally plain. More precisely, God’s eternal power and divine nature have been clearly perceived. Paul’s content on general revelation here is describing a demographic of the humanity, i.e., a culture that has incorrectly interpreted nature. These are humans, creatures of God outside of the covenant (1:25; 2:14), who have rejected what can be clearly perceived about God in creation. Their rejection leaves them “without excuse.”
The details of this passage do not lay out for us the specifics of general revelation. They only tell the reader that people can discern enough about God in creation to make them accountable. Creation is set to be interpreted. It does not interpret itself. This passage gives us the converse of what Psalm 19 and Job 38 suggest: this is what happens when nature is interpreted without the intervention of God’s particular revelation.
Calvin writes, “[W]hile some may evaporate in their own superstitions and other deliberately and wickedly desert God, yet all degenerate from the true knowledge of him” (I.IV.1, italics mine.) This passage in Paul demands his explanation in Romans 10:13-17, concluding—“So faith comes from hearing, and hearing through the word of Christ.”
If the human intellect would see God in creation, then God must sanctify the intellect by his work of grace, which we understand to be accomplished definitively in the death and resurrection of Jesus Christ. Seeing nature is a work of gospel grace—it happens only in relation to Jesus Christ and is appropriated by the Holy Spirit.