Berean Study Bible
At this stage of Paul’s defense, Festus exclaimed in a loud voice, “You are insane, Paul! Your great learning is driving you to madness!”

King James Bible
And as he thus spake for himself, Festus said with a loud voice, Paul, thou art beside thyself; much learning doth make thee mad.

American Standard Version
And as he thus made his defense, Festus saith with a loud voice, Paul, thou art mad; thy much learning is turning thee mad.

Darby Bible Translation
And as he answered for his defence with these things, Festus says with a loud voice, Thou art mad, Paul; much learning turns thee to madness.

Douay-Rheims Bible
As he spoke these things, and made his answer, Festus said with a loud voice: Paul, thou art beside thyself: much learning doth make thee mad.

English Revised Version
And as he thus made his defence, Festus saith with a loud voice, Paul, thou art mad; thy much learning doth turn thee to madness.

Young's Literal Translation
And, he thus making a defence, Festus with a loud voice said, 'Thou art mad, Paul; much learning doth turn thee mad;'