Albert Barnes Commentary Job 10:14

"If I sin, then thou markest me, And thou wilt not acquit me from mine iniquity." — Job 10:14 (ASV)

If I sin - The object of this verse and the following is, evidently, to say that he was completely perplexed. He did not know how to act. He could not understand the reason for the divine dealings and was entirely unable to explain them; consequently, he did not know how to act in a proper manner. It is expressive of a state of mind where the individual wishes to think and feel right, but finds so much to perplex him that he does not know what to do.

Job was sure that his friends were not right in the position they maintained—that he was a sinner of enormous character and that his sufferings were proof of this—and yet he did not know how to answer their arguments. He desired to have confidence in God, and yet he did not know how to reconcile God's dealings with his own sense of right.

He felt that he was a friend of God, and he did not know why God should afflict someone who had this awareness in such a distressing and painful manner. His mind was perplexed, wavering, and embarrassed, and he did not know what to do or say.

The truth in this whole argument was that he was more often right than his friends. However, in common with them, he had embraced some principles that he was compelled to admit were true, or that he could not demonstrate to be false. These principles gave his friends a great advantage in the argument, which they now pressed upon him with overwhelming force.

Then you mark me - You carefully observe every fault. Job could not see why God did this. He expressed the same difficulty in Job 7:17-19 (see the notes at that place).

And will not acquit me - You will not pardon me. Job did not understand why God would not do this. It was exceedingly perplexing to him that God held him to be guilty and would not pardon him if he had sinned. He expressed the same perplexity in Job 7:21 (see the note at that verse).