Take heed, regard not iniquity: for this hast thou chosen rather than affliction.
Regard - literally, turn thyself to.
Iniquity - namely, presumptuous speaking against God (Job 34:5, and above Job 36:17-18, note).
Rather than - to bear "affliction" with pious patience. Men think it an alleviation to complain against God. But this is adding sin to sorrow; it is sin, not sorrow, which can really hurt us (contrast Hebrews 11:25).