Chapter One - The Heathen (The Unrighteousness) are condemned by Creation.
Chapter Two - The Hypocrite (The Self-Righteous) are condemned by his Conscience.
Chapter Three - The Hebrew (The Super-Righteous) are condemned by his Commandments.
God has spoken externally to the heathen throught his creation.
God has spoken internally to the Hypocrite, the moral person through his conscience, and
God has spoken Biblically to the Hebrew throught the Scriptures.
Mankind has rejected God. "There is none righteous; no, not one." (Romans 3:10)