Love takes no pleasure in evil, but rejoices in the truth.
The apostle gives us in these verses some of the properties and effects of charity, both to describe and commend it, that we may know whether we have this grace and that if we have not we may fall in love with what is so exceedingly amiable, and not rest till we have obtained it. It is an excellent grace, and has a world of good properties belonging to it.
Commenting on 1 Corinthians 13:4-7
Rejoiceth not in iniquity,.... Neither in his own, nor in others; but on the contrary is grieved for it; he mourns over his own iniquities, the corruption of his heart, the infirmities of his life, his secret sins, which none know but God and his own soul; he is greatly troubled at the profaneness and immorality of the men of the world, and the sins...
Verse 6. Rejoiceth not in iniquity. Does not rejoice over the vices of other men; does not take delight when they are guilty of crime, or when, in any manner, they fall into sin. It does not find pleasure in hearing others accused of sin, and in having it proved that they have committed it.