Adam Clarke on Acts 24:16

And herein do I exercise myself - And this very tenet is a pledge for my good behavior; for as I believe there will be a resurrection, both of the just and unjust, and that every man shall be judged for the deeds done in the body, so I exercise myself day and night, that I may have a conscience void of offense toward God and toward men.

Toward God - In entertaining no opinion contrary to his truth; and in offering no worship contrary to his dignity, purity, and excellence.

Toward men - In doing nothing to them that I would not, on a change of circumstances, they should do to me; and in withholding nothing by which I might comfort and serve them.