74 I know Whose ministers we are, and where we are placed, and whither we are guides. I know the height of God, and the weakness of man, and, on the contrary, his power. Heaven is high, and the earth deep; and who of those who have been cast down by sin shall ascend? Who that is as yet surrounded by the gloom here below, and by the grossness of the flesh can purely gaze with his whole mind upon that whole mind, and amid unstable and visible things hold intercourse with the stable and invisible? For hardly may one of those who have been most specially purged, behold here even an image of the Good, as men see the sun in the water. Who has measured the water with his hand, and the heaven with a span, and the whole earth in a measure? Who has weighed the mountains in scales, and the hills in a balance? What is the place of his rest? and to whom shall he be likened?
Source: Orations (New Advent)