God. Isaiah did not see God because he was more spiritually attuned than others; he saw God because God had revealed Himself to him. He whom Isaiah sees is the Lord (ʾadonai), the God who is able to carry out His purposes. In this vision the power of God is to be manifested in His hardening of the hearts of men. He who can harden men’s hearts is truly sovereign, and it is God as the sovereign One whom Isaiah sees. At the same time the appearance is in a human form, so that man can behold it. Calvin
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