This "turn the other cheek" teaching from Jesus is correctly recognized as calling Christians to non-resistance. Over the years there has been some controversy over whether this passage means that Christians cannot fight in wars or defend their homes and family from threats to life and property. While it is possible that Christians must consider this passage in such situations, it is also important that Jesus does not include those kinds of threats in his illustrations of how to practice the Christian principle of non-resistance.
In this study, we notice that Jesus calls his followers--anyone who wants to practice what is genuine righteousness--to follow his lead in coming alongside others as friends. These others are those who treat one's self wickedly, such as an insulting and belittling slap in the face or a lawsuit to forcibly claim property from you. Jesus earned a reputation as "friend of sinners," and he calls us to do likewise.