Therefore. Because all previous judgments have been in vain, therefore will I send upon them something more terrible still. Thus. God says not how; he leaves the nature of the coming chastisement in mysterious uncertainty, that the very suspense may work fear and repentance.
Because I will do this (pointing back to the mysterious "thus" above) unto thee; because I am ready to bring on thee still heavier punishment. Prepare to meet thy God; Septuagint, ἐτοιμάζου τοῦ ἐπικαλεῖσθαι τὸν θεόν σου, "Prepare to call upon thy God."
Make ready to meet thy God in judgment, turning to him with changed heart, if perchance he may forgive thee and withdraw his heavy hand. Another explanation, derived from Symmachus and adopted by a Lapide, Schegg, and others, "Praeparare ut adverseris Deo tuo"—an ironical encouragement to them to withstand God—deprives the following verse of its suitability to the context.
For the prophet would hardly invite them to this contest by expatiating upon God's almightiness.