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In the New Testament the basic command of old covenant life, 'Be holy as I am holy', now means, 'Become like Jesus.' God involves himself in this work as the triune Lord: the Father commands it; the Son has died to provide the resources for it; the Spirit indwells us in order to effect it in our lives. As Augustine famously prayed, God commands what he wills and gives what he commands.
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Sinclair B. Ferguson (Devoted to God)