Adam Clarke on Job 11:13

If thou prepare thine heart - Make use of the powers which God has given thee, and be determined to seek him with all thy soul.

And stretch out thine hands toward him - Making fervent prayer and supplication, putting away iniquity out of thy hand, and not permitting wickedness to dwell in thy tabernacle; then thou shalt lift up thy face without a blush, thou wilt become established, and have nothing to fear, Job 11:14, Job 11:15.

There is a sentiment in Pro 16:1, very similar to that in the Job 11:13, which we translate very improperly: - לאדם מערכי לב leadam maarchey leb.

To man are the preparations of the heart: ומהוה מענה לשון umeyehovah maaneh lashon.

But from Jehovah is the answer to the tongue.

It is man's duty to pray; it is God's prerogative to answer. Zophar, like all the rest, is true to his principle. Job must be a wicked man, else he had not been afflicted. There must be some iniquity in his hand, and some wickedness tolerated in his family. So they all supposed.