1. They treasure up wrath against the day of wrath, and so they destroy themselves. They are doing that, every day, which will be remembered against them another day (v. 12): The iniquity of Ephraim is bound up, and his sin is hid; God took notice of it, kept it upon record, and will produce it against him and reckon with him for it afterwards. Their former sins contributed to their present destruction; for they were laid up in store with God, Deut. xxxii. 34, 35; Job xiv. 17. It is laid up in safety, and will not be forgotten, nor the evidence against him lost; but it is laid up in secret; it is hid; the sinner himself is not aware of it. It is bound up in God's omniscience, in the sinner's own conscience. Note, The sin of sinners is not forgotten till it is pardoned, but an exact account is kept of it, which will be opened in proper time.