Ephesians 4:25–32

Verse 26. Be angry, and sin not, as it is said Psalms 4:5. Anger, as a passion of the mind, may proceed from a good motive and be guided by reason; as our Saviour, Christ, (Mark 3:5) is said to have looked about at the Jews with anger, that is with a zeal against their blindness and malice.—Let not the sun go down upon your anger. If moved to anger, return without delay to a calmness of mind and temper. Witham.—Be angry when reason or necessity compels you; but even then, so restrain your anger that you neither offend God nor scandalize your neighbour. Moreover, lay it aside as soon as you are able, so that the sun go not down upon your anger. Jansenius.

or, opportunity

Verse 29. That it may afford grace to the hearers; that is that your speech may contribute to their good and edification. Witham.

Verse 30. Grieve not the Holy Spirit: not that the Holy Ghost can be contristated. It is a metaphor; and the sense is, sin not against the Holy Ghost. Witham.—To contristate the Holy Spirit is a metaphorical expression, which signifies to offend God, or the Holy Ghost, who has sealed us by the sacraments of baptism and confirmation with particular marks, by which we shall be distinguished from others in the day of our retribution. SS. Chrysostom, Jerom, Ambrose, and so forth