Charles H. Spurgeon on Psalms 32:5

Thou forgavest the iniquity of my sin. We must observe the matter forgiven, and the manner of forgiving. The matter forgiven is the iniquity of his sin. It is disputed what is here meant by iniquity, whether culpa or paena. Some understand paenam, and think that an allusion is made in this word unto the message of Nathan, wherein God doth remit the heaviest stroke of his wrath, but yet retains some part in punishing the child, and permitting Absalom to rebel and abuse king David's concubines: so Theodoret, Deus non condigna paena Davidem punivit. Some understand culpam, and will have this phrase to be an amplification of that, as if superbia defendens, or taciturnitas celans, or impietas contra Deum assurgens, or some such great guilt were meant by this phrase. But as I do not censure these opinions, which may well stand, so I think the phrase looks back into that word which was in the confession. The sin confessed was (evp) and this is but an analysis of this word; for (ytajx Nwe), what is it, word for word, but the perverseness of my aberration? (hajx) is an aberration from the scope or mark whereat we aim; all men aim at felicity, but most men stray from it, because they are not led by the law that guides unto it, the violating whereof is called (hajx) But some do stray out of mere ignorance, and they only break the law; some out of stubbornness, which will not submit themselves to the Lawgiver; these men's sin is called perverseness, which God is said here to forgive. So that David did not confess more against himself than God includes in his pardon. Well may God exceed our desire; he never doth come short thereof if it do concern our spiritual, our eternal good. As he doth exclude no sinner that doth confess, so doth he except against no sin that is confessed. Arthur Lake.