He gives two ways that God has accomplished this. The first is that, deep within the secret recesses of the soul of every man there is an unshakable knowledge that his very existence was caused by a Creator. The extent of this knowledge is said to be GOD'S ETERNAL POWER AND DIVINE NATURE.
Second, man's existence is clearly seen in the things God has created. Psalm 19:1-6 gives a clearer declaration of God's revelation of Himself in nature everyday and it is declared in every speech and language and penetrates to the ends of the earth where a man may be found.