that God, the source and end of all things, can be known with certainty from the consideration of created things, by the natural power of human reason: ever since the creation of the world, his invisible nature has been clearly perceived in the things which have been made [Rm 1, 20]. It was, however, pleasing to his wisdom and goodness to reveal himself and the eternal laws of his will to the human race by another, and that a supernatural, way. This is how the Apostle puts it: In many and various ways God spoke of old to our fathers by the prophets; but in these last days he has spoken to us by a Son

The perpetual agreement of the catholic church has maintained and maintains this too: that there is a twofold order of knowledge, distinct not only as regards its source, but also as regards its object. With regard to the source, we know at the one level by natural reason, at the other level by divine faith. With regard to the object, besides those things to which natural reason can attain, there are proposed for our belief mysteries hidden in God which, unless they are divinely revealed, are incapable of being known.