Romans 1:20 - Matthew Poole's English Annotations on the Holy Bible

Because it might be further objected in behalf of the Gentiles, that the notions of God imprinted in their nature are so weak, that they may be well excused; therefore the apostle adds, that the certainty of them is further confirmed by the book of the creatures, which was written before them in capital letters, so that he that runs may read. The invisible things of him: the apostle tells us afterwards himself what he means by the invisible things of God, viz. his being and his attributes, particularly his eternity and almighty power; to which we might add, his wisdom, goodness, &c. These, though invisible in themselves, yet are discernible by his works, and that ever since the creation of the world. By what they see created, they may easily collect or understand, that there is an eternal and almighty Creator; they may argue from the effects to the cause. So that they are without excuse: some render it, that they may be without excuse; but it is better rendered in our translation: the meaning is not, that God gave them that knowledge for this end and purpose, that they might be inexcusable, for they might catch even at that for an excuse; but the plain sense is this, that God hath given all men such means of knowledge as sufficeth to leave them without excuse, there can be no pretence of ignorance.