How do we know the doctrine of kindness is true?

The doctrine of kindness is demonstrated through various scriptural narratives, notably in the account of David in 2 Samuel 10. David's attempt to show kindness to Hanun, underpinned by a prior relationship with Hanun's father, serves as a practical illustration. However, this kindness is juxtaposed with God's command to remain separate from the ungodly, raising essential questions about the efficacy of such acts. True kindness, according to the scripture, is not merely about goodwill gestures but must be aligned with God’s expectations and the broader context of one’s actions. This means that acts of kindness must reflect integrity, adhering to God’s principles, rather than following social or diplomatic expectations that could lead to spiritual compromise.