Charles H. Spurgeon on Psalms 130:3

If thou, LORD, shouldest mark. If thou shouldest inquire and scrutinize, and then shouldest retain and impute: (for the Hebrew word imports both:) if thou shouldest inquire, thou wouldst find something of iniquity in the most righteous of mankind; and when thou hast found it, if thou shouldest retain it, and call him to an account for it, he could by no means free himself of the charge, or expiate the crime. Inquiring, thou wouldst easily find iniquity; but the sinner by the most diligent inquiry will not be able to discover a ransom, and therefore will be unable to stand, will have no place on which to rest his foot, but will fall by the irresistible judgments of thy law, and the sentence of thy justice. —Robert Leighton.