How do we know that insincere blessings can be harmful?

In Acts 16:16-18, we see Paul confronted by a girl possessed by a spirit of divination, who proclaimed the truth that he and his companions were servants of the Most High God. However, her intent was not aligned with the gospel; her repeated statements were a distraction and confusion. Recognizing the spiritual nature of her flattery, Paul commanded the spirit to come out of her. This incident underlines that blessings or affirmations that stem from an insincere source can, instead, detract from the message of grace and truth that God desires to convey. It serves as a caution against accepting praises or affirmations that lack genuine heart and purpose.