O Job, thy business is not to quarrel with thy Maker, or his works, but to address thyself to him. Prepare thine heart, to wit, to seek God, as it is expressed, 2 Chronicles 19:3, 2 Chronicles 30:19 Psalms 78:8. If thou prepare thy heart by sincere repentance for all thy hard speeches of God, and sins against him, and with a pure and upright heart seek unto him; without which thy prayers will be in vain. Or, If thou directest, or rectifiest, thine heart, turning thy bold contentions with God into humble and sincere supplications to him. Stretch out thine hands, i.e. pray, which is here described by its usual gesture; as Job 15:25 Psalms 88:9. Towards him, i.e. to God, as appears both from the nature of the thing, and from the context.
Related Commentaries of Job 11:13
Job 11:13
13 If thou prepare thine heart, and stretch out thine hands toward him;