Charles Ellicott Commentary Acts 24:16

"Herein I also exercise myself to have a conscience void of offence toward God and men always." — Acts 24:16 (ASV)

And herein do I exercise myself ...—The “herein” seems equivalent to “in this belief.” Because he held that doctrine of a resurrection as a stern and solemn reality, the one law of his life was to keep his conscience clear from willful sin. (See Note on Acts 23:1.) The words must have been almost as bitter to Felix as to Ananias; but he has, in any case, the decency to listen in silence.