“Because that which may be known of God is manifest in them; for God hath shewed it unto them.”
King James Version (KJV)
1:19 For what is to be known of God - Those great principles which are indispensably necessary to be known. Is manifest in them; for God hath showed it to them - By the light which enlightens every man that cometh into the world.
Ro 1:19 Because. Here he begins to show why God's wrath is manifest. They are inexcusable because "that which may be known of God is manifest in them". Ro 1:20 shows what may be known of God by all.