It is as high as heaven; what canst thou do? deeper than hell; what canst thou know?
It is as high as heaven - the "wisdom" of God (Job 11:6). The abruptness of the Hebrew is forcible: 'The heights of heaven! What canst thou do?' as to attaining to them with thy gaze (Psalms 139:8).
What canst thou know - namely, of His perfections.