These two verses summarized the teaching on love of enemy. Do not seek redress. Treat everyone the same way. Such behavior opens the door to evangelization. For even sinners love those loving them.
Sinners do the same.
Sinners lend to sinners so that they might receive back the same amount. But, love your enemies, do good, and lend expecting nothing in return. Your reward will be great and you will be sons of the Most High because he is kind to the ungrateful and the evil. Christians were not to simply extend loyal, good works, and self-giving to other Christians. Stopping there would not distinguish followers of Jesus from any other group.