New Living Translation
Suddenly, Festus shouted, “Paul, you are insane. Too much study has made you crazy!”

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.

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!”

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.

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.

World English Bible
As he thus made his defense, Festus said with a loud voice, "Paul, you are crazy! Your great learning is driving you insane!"

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;'

Acts 26:24 Additional Translations ...