ot every man in history has had a Bible to read in his language. In fact, many men couldn't (or can't) read anything at all, whether the Word of God existed in their language or not (illiteracy). So, do they escape culpability because they have not been privy to the words of Scripture? No! Romans 1:18, 19 & 20 make it abundantly clear that even if the only knowledge that a man has about God is the little which he can see in the creation around him, that is enough to condemn him. It's not enough to save him though: the gospel of God’s grace is required for that to occur. Ezekiel 33:8 and Romans 10:14 make that point plainly. Anyway, Psalm 19:1-6 tells us that the glory of God is declared everywhere; in every location under the sky; wherever the sun rises and sets.
Psalm 19:7-11 point to written revelation and the perfection of it. The Bible is accurate, dependable, right, pure and infinitely valuable. It is the tool that God has chosen to use to show us our depravity, to declare His plan of redemption, to develop faith in our hearts and to cleanse us from the filthiness of our natural ways (Romans 7:7, Hebrews 10:7-10, Romans 10:17, Ephesians 5:26 & Psalm 119:9). Hebrews 4:12 describes God's Word as being alive, powerful and precise!
God doesn't JUST speak to us through the natural environment and through His infallible Scriptures. He also speaks to our hearts through the Holy Ghost. So, Psalm 19:12-14 covertly introduces to us this third way that God's speaks to His children... and that is by His Spirit.