The Witness of the Stars

For more than two thousand five hundred years the world was without a written revelation from God. The question is, Did God leave Himself without a witness? The question is answered very positively by the written Word that He did not. In Rom. i. 19 it is declared that, "that which may be known of God is manifest in them; for God hath showed it unto them. For the invisible things of Him from the creation of the world are clearly seen, being understood by the things that are made, even His eternal power and Godhead; so that they are without excuse." But how was God known? How were His "invisible things," i.e., His plans, His purposes, and His counsels, known since the creation of the world?