If we love only those who show love to us, what thanks do we have? Even sinners do that.
If we do good only to those who do good to us, does that not show our standards for righteousness is no higher than that of the world?
If we are generous only to those from whom we hope to receive a return, what thanks do we have? Sinners eagerly lend to sinners in order to receive something back.
Go ahead and show love to those who detest you. Be kind to those who are trying to drive you and your relationship with Christ out of the public eye. Not only will God himself reward us (don’t expect the world to), but we will show ourselves to be children of the Highest.
God himself is kind to those who are unthankful. He extends grace to those whose thoughts and actions are evil. Didn’t he show such kindness and graciousness to us when we were among the heathen?
The Father is merciful. Should not his children be also? (Luke 6)