What does Psalm 19:3 mean?

Because every living human being is exposed to nature, no one can claim to have missed out on its message about the Creator. Combined with verse 1, this is an important counter to the argument that some people "do not know" about God. David insists "there is no speech, nor are there words, whose voice is not heard." This statement may mean there is no speech or language where nature's message is not heard, or it may mean it is not a speech or language whose voice is not heard.

Creation is like a book of pictures without words, but its message is clear to all who read it. People on every continent and on every island can read creation's message and conclude there is a wise, eternal, powerful, and benevolent God behind it all. Those who reject nature's message also reject nature's Creator. Although some human beings deny the Creator and insist that the universe came into existence by accident, they must bear the guilt and consequences of their unwillingness to believe in God (Romans 1:19–20).