Contradiction with Matthew 5:44
This verse advises to love your enemies and to do good to those who hate you, which contrasts with the notion of 2 Thessalonians 1:5 relating to retribution.
Matthew 5:44: But I say unto you, Love your enemies, bless them that curse you, do good to them that hate you, and pray for them which despitefully use you, and persecute you;
Paradox #1
The contradiction or conflict in this verse could be the idea that suffering or hardship is seen as evidence of being deemed worthy for God's kingdom. Some might find it inconsistent or troubling that pain or persecution are tied to being validated or rewarded by a divine power, as it may seem to suggest that suffering is necessary or justified.