So speak ye, and so do (houtōs laleite kai houtōs poieite). Present active imperatives as a habit. For the combination see Jam 1:19-21 contrasted with Jam 1:22-25, and Jam 1:26 with Jam 1:27.
By a law of liberty (dia nomou eleutherias). The law pictured in Jam 1:25, but law, after all, not individual caprice of “personal liberty.” See Rom 2:12 for this same use of dia with krinō in the sense of accompaniment as in Rom 2:27; Rom 4:11; Rom 14:20. “Under the law of liberty.”