to their own ministry (Acts 13:46–47; cf. Acts 26:18, 23). The apostle Paul also wrote to the Corinthians of ‘the light of the knowledge of the glory of God in the face of Christ’, which had shone in their hearts (2 Cor. 4:6). The second use of light, namely to symbolize righteousness, is already plain in Isaiah 5:20, where the inhabitants of Judah are so morally perverse that they ‘call evil good and good evil … put darkness for light and light for darkness’. In the ethical instruction contained
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