Have you comprehended the expanse of the earth? Declare, if you know all this.
The Lord here proceeds to ask Job many puzzling questions, to convince him of his ignorance, and so to shame him for his folly in prescribing to God. If we will but try ourselves with such interrogatories as these, we shall soon be brought to own that what we know is nothing in comparison with what we know not.
Commenting on Job 38:12-24
Hast thou perceived the breadth of the earth?.... Which may be put for all the dimensions of it, length, breadth, diameter, and circumference, but especially it regards the surface of it, and the measurement of that; hast thou gone over the whole face of the earth and measured it, all its parts, its hills and dales, rocks and mountains, and took a survey of all...
The breadth of the earth? - At that time the circumference of the globe was not known, because the earth itself was supposed to be a vast extended plain, bordered all round with the ocean and the sky.