People are guilty

¹⁸ God in heaven shows that he is angry with people. He is angry because they do not respect him and they do bad things. Because they continue to do those bad things, they choose not to accept God's true message. ¹⁹ They should understand what God is like, because God himself has shown it to them clearly. ²⁰ Ever since God made the world, he has been showing people clearly about himself. We cannot see God. But the things that he has made show us clearly what he is like. We can understand his great power that continues for ever. We can know that he is the true God. So there is no reason for anyone to say, ‘We could not know about God.’