Paul makes it clear (Romans 1:20) that everybody sees this manifestation of God’s majesty. This revelation gets through to all people so that all people see it clearly. The force of Paul’s assertion is that every person who has ever lived knows that there is a God and is aware of His transcendent majesty and holiness. The medium God has selected to reveal Himself universally is so clear and so potent that it leaves no one with an excuse. It is a medium far more powerful and effective for its task than a television broadcast.
– R.C. Sproul, The Holiness of God, Tyndale House Publishers, Carol Stream, Ill., Copyright 1985, Kindle Edition