The heaven for height, and the earth for depth,.... These are eminent for what are ascribed to them; nothing is higher than the heavens, nor anything deeper than the earth; the height of the heavens cannot be reached, and the centre of the earth cannot easily be got unto; the heavens above cannot be measured, and the foundation of the earth cannot be searched beneath; at least not by common persons, whatever may be done in their way by astronomers and geometricians.
And thus, as the heavens and the earth are immeasurable, Jer 31:37; sothe heart of kings [is] unsearchable; especially such an one as Solomon was, who had largeness of heart as the sand on the seashore: and this must be understood of such who have the art of governing; for some are so weak in their conduct, and so much expose themselves, that it is easy to see what is in their hearts, and what are the springs of their actions.