Matthew 6:1 Be careful not to do your acts of righteousness before man, to be seen by them. If you do, you will have no reward from your Father in heaven.
Do not cover up your sin by showing kindness.
King David was mourning for his son Absalom he shows kindness and trully sincere with his act. Joab killed Absalom, he is putting guilt to David, trying to cover up his sins in killing Absalom.
Sometimes in our walk with the Lord we are discourage, we should continue to pressed on. Do we do it for man or for the Lord?
If we do it for the Lord we wouldn't be discourage. As discouragement comes from Satan. Discouragement is when we are looking to ourselves and not from the Lord.
We need to serve the Lord wholeheartedly, genuine and sincere before God. We need to show kindness to God from within our hearts.
Shimei was the one who curse David.
Ziba was the one who betrayed David.
We can not cover our sins to God by showing kindness.