John Chrysostom
He spoke well: "Do not be frightened," for the actions of enemies are such that they only frighten. He says, "in nothing": whatever may happen, whether dangers or plots. Such is the character of courageous people. Enemies can do nothing to them, except frighten them. Since Paul's countless sufferings were probably troubling the Philippians, he does not say, "do not be anxious," but "do not be frightened." More than this, he tells them to disregard their enemies completely. If you are in such a state of soul, this will be an evident sign of their destruction and of your salvation. When they see that their countless plots cannot even frighten you, they will be convinced of their own destruction.
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When persecutors do not overcome the persecuted, plotters do not overcome those against whom they plot, and rulers do not overcome their subjects, is it not clear to them that they themselves are perishing? Is it not clear that they have no power, that their hopes are vain and their efforts weak?