Adam Clarke on Acts 26:26

Before whom also I speak freely - This is a farther judicious apology for himself and his discourse. As if he had said: Conscious that the king understands all these subjects well, being fully versed in the law and the prophets, I have used the utmost freedom of speech, and have mentioned the tenets of my religion in their own appropriate terms.

This thing was not done in a corner - The preaching, miracles, passion, death, and resurrection of Jesus Christ, were most public and notorious; and of them Agrippa could not be ignorant; and indeed it appears, from his own answer, that he was not, but was now more fully persuaded of the truth than ever, and almost led to embrace Christianity.