In the study of all other sciences man places himself above the object of his investigation and actively elicits from it his knowledge by whatever method may seem most appropriate, but in theology he does not stand above but rather under the object of his knowledge. In other words, man can know God only in so far as the latter actively makes Himself known. God is first of all the subject communicating knowledge to man, and can only become an object of study for man in so far as the latter appropriates and reflects on the knowledge conveyed to him by revelation. Without revelation man would never have been able to acquire any knowledge of God. And even after God has revealed Himself objectively, it is not human reason that discovers God, but it is God who discloses Himself to the eye of faith.
How humbling. Whatever knowledge we have of God is only possible because he revealed himself to us. Apart from revelation, we are in the dark.