We are all heretics by nature and take to error as instinctively as ducks take to water. This does not mean that natural theology is wholly false, for the heavens declare the glory of God and the visible universe shows His eternal power and Godhead. Add to these the presence in the human heart of that light that lights every man that comes into the world, and you have the source of a certain body of truth known more or less clearly by the whole human race.
The knowledge thus received, however, is inadequate; it forms little more than a frame for the total picture. The details are all unknown and undiscoverable, so that we must depend upon divine revelation as given in the holy Scriptures to fill in the particulars and render the picture intelligible. The brush of the Holy Spirit labors to complete the work and to show every hill and rock and tree and blade of grass, each in its proper relation to everything else.