C. F. Keil and Franz Delitzsch on Job 11:7-9

Job 11:7-9   7  Canst thou find out the nature of Eloah,

And penetrate to the foundation of the existence of the Almighty?   8  It is as the heights of heaven-what wilt thou do?

Deeper than Hades-what canst thou know?   9  The measure thereof is longer than the earth,

And broader than the sea.

The majority of modern commentators erroneously translate חקר searching = comprehension, and תּכלית perfection, a meaning which this word never has. The former, indeed, signifies first in an active sense: finding out by search; and then also objectively: the object sought after: “the hidden ground” (Ewald), the depth (here and Job 38:16; also, according to Ew., Job 8:8, of the deep innermost thought). The latter denotes penetrating to the extreme, and then the extreme, πέρας, itself (Job 26:10; Job 28:3). In other words: the nature that underlies that which is visible as an object of search is called חקר; and the extreme of a thing, i.e., the end, without which the beginning and middle cannot be understood, is called תכלית. The nature of God may be sought after, but cannot be found out; and the end of God is unattainable, for He is both: the Perfect One, absolutus; and the Endless One, infinitus.