Luke 10:17

17.And the seventy returned. It is evident, that the faith of the seventy disciples in the words of Christ had not been full and complete, when they returned, exulting over it as a thing new and unexpected, that they had cast out devils by the power of Christ. Nay, they had received this power accompanied by a command. At the same time, I have no doubt that, when they departed, they were convinced that nothing which the Master had said to them would fail of its accomplishment; but afterwards, when the matter proceeded to an extent which surpassed their expectations, they were astonished at the sight. (51) And this is frequently the case with believers, that they receive from the word but a slight perception of the Divine power, and are afterwards excited to admiration by actual experience. What was the nature of that joy will more clearly appear from Christ’s reply.