Contradiction with Galatians 3:19
This verse suggests the law was added because of transgressions, while 2 Corinthians 3:10 implies the surpassing glory of the new covenant over the law.
Galatians 3:19: Wherefore then [serveth] the law? It was added because of transgressions, till the seed should come to whom the promise was made; [and it was] ordained by angels in the hand of a mediator.
Contradiction with Matthew 5:18
This verse indicates that not one jot or tittle of the law will pass away, contradicting 2 Corinthians 3:10's emphasis on the glory surpassing the former.
Matthew 5:18: For verily I say unto you, Till heaven and earth pass, one jot or one tittle shall in no wise pass from the law, till all be fulfilled.
Contradiction with Romans 7:12
This verse states that the law is holy, just, and good, contrasting with 2 Corinthians 3:10 which suggests the law's former glory is diminished.
Romans 7:12: Wherefore the law [is] holy, and the commandment holy, and just, and good.