John Chrysostom
This did not happen under Christ, and from this one may see that what He said was now fulfilled in deed. What exactly was this? "He who believes in Me, the works that I do he will do also, and greater works than these he will do" (Jn 14:12). Great was the faith of those who came, even greater than under Christ. Why did this happen? Because Christ had foretold it, saying, "He who believes in Me, the works that I do he will do also, and greater works than these he will do" (Jn 14:12). They remained there and did not go about through cities and villages. Yet everyone brought their sick to them on beds and couches, and everywhere they manifested wonders.
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This was seen in those who believed, in those who were healed, in the one punished, in their boldness before those Jews, and in the very virtue of those who had firmly believed. All this did not come from the signs alone. In humility they ascribed nothing to themselves, saying that they did these things in Christ's name. Yet their life and virtue also brought this about. And see, the writer does not speak here of the number of those who believed, but leaves the hearer to judge it for himself. Thus the believers increased to an innumerable multitude. Together with this, the Resurrection of Christ was proclaimed still more.