John Chrysostom
See how He persuades him, and how afterward He tells him what especially encouraged him: "I have many people in this city." How then, someone may say, did they all attack him together? But they did him no harm. They only brought him to the proconsul.
"And do not keep silent," He says, "for I have many people in this city." Perhaps for this reason Christ appears to him.
"Do not be afraid," He says. This was enough to encourage him. He is convicted of fear, or rather, he is not convicted but encouraged, so that this would not happen to him. God did not allow the apostles constantly to suffer calamities, lest they grow faint.
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Nothing grieved Paul so much as unbelievers and those who opposed him. This was heavier for him than dangers themselves. "And do not keep silent, for I have many people in this city." Perhaps for this reason Christ appears to him.