1:19-21 What does it mean here to be swift to hear, slow to speak, slow to wrath?

James is admonishing Christians here to always be eager to listen to Godly teaching and counsel but at the same time to be guarded in their own conversation and not speak hastily or foolishly.

They must carefully consider what they are going to say before taking part in any conversation (CP Pr 10:19; 13:3; 17:27-28; Ecc 5:1-3; Mt 5:37; Jas 5:12). Slow to wrath means that Christians are not to lose their temper and sin in anger (CP Pr 14:17; 16:32; Ecc 7:9; 1Cor 13:4-5; Eph 4:26).

Christians are to put aside all filthiness and superfluity of naughtiness in order to receive the engrafted, or implanted, word of God with meekness. Filthiness here means moral vices, while naughtiness means wickedness of heart, life, and character.

The believer's new life in Christ demands that they get rid of all moral filth and wickedness which prevents God's word implanting itself in their spirit (CP Eph 5:4-8; Col 3:1-10).