Even the disciples who missed the Transfiguration are growing. Rather than hiding their failure, they admit it and ask for help, “Why could we not cast it out?” (v. 28). Jesus has to be encouraged by their question. They know that He has not given up on them and He knows that they want to change. So, rather than castigating them for their failure, Jesus points them to the source of their power. “And He said to them, ‘This kind can come out by nothing but prayer and fasting’” (v. 29). Scholars generally
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