John Chrysostom
That I am not boasting, he says, is witnessed by those who were present with me, who led me by the hand, and who saw this light. Do not be surprised that the writer speaks here in one way and elsewhere in another. In another place he says, "The men who journeyed with him stood speechless, hearing the voice but seeing no one" (Acts 9:7). There is no contradiction here. There were two voices, Paul's and the Lord's. There he speaks of Paul's voice, while here he adds, "but they did not hear the voice of Him who spoke to me." Thus the words "seeing no one" do not mean that they did not see, but that they did not hear the Lord's voice. He did not say that they did not see the light, but that they "stood speechless, hearing a voice but seeing no one," that is, no one speaking.
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And this did not happen without reason. He alone had to be counted worthy of that voice. If they too had heard it, the miracle would not have been so great. Since crude men are persuaded more by sight, they saw only the light. Yet this was sufficient for their conviction, and therefore they "were afraid." Moreover, the light did not act on them as it did on him. It blinded him, thereby urging them also to see, if they wished. By God's providence, it seems to me, they did not believe, so that they might be trustworthy witnesses.