Commentary of Charles Spurgeon, Adam Clarke & Matthew Henry
Vs.6
The matter of its joy and pleasure is here suggested:
1.
Negatively: It rejoiceth not in iniquity. 
It thinks not evil of any, without very clear proof. It
wishes ill to none, much less will it hurt or wrong any, and least of all make
this matter of its delight, rejoice in doing harm and mischief.
Nor will it
rejoice at the faults and failings of others, and triumph over them, either out
of pride or ill-will, because it will set off its own excellences or gratify its
spite.
2. Affirmatively: It rejoiceth in the truth, is
glad of the success of the gospel and rejoices to see men moulded into an
evangelical temper by it, and made good.
Those who are filled with the love of God rejoice in the truth.
