Acts 26:24

Paul, thou art beside thyself. The earnestness and fervor of Paul were so strange to Festus, his doctrine of the resurrection so novel, his manner so sincere, and his testimony so startling, that the Roman could only explain it by a mental delusion.

Much learning doth make thee mad. The display of such vast knowledge of the Hebrew Scriptures to Agrippa convinced him that intense study resulted in derangement. It must not be forgotten that Festus had just come into his position, and knew little of Paul.
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