1 Thessalonians 5:15

“See that none render unto any one evil for evil; but always follow after that which is good, one toward another, and toward all”

“See that”: “Take care” (TCNT). “Be sure” (Phi). “Make sure” (Stott p. 123). This admonition is addressed to all members of the Church, we are are indeed our brother's keeper! God expects. tremendous amount of maturity out of these new converts. “Many of these people had freshly emerged from paganism and this instruction was most appropriate, for the Greeks were remarkable for their undying feuds” (Denton Lectureship p. 190). “None”: Such behavior is inexcusable for any Christian, young or old, new convert or elder. “Unto any one”: Christian or non-Christian. “Evil for evil”: “Wrong for wrong” (TCNT). This is why God is against the individual taking vengeance. Retaliation usually results in another "evil". Government is given the "right" to avenge wrongs and punish the evildoer, but not the individual (Compare Matthew 5:38; Romans 13:1). Morris notes, “Subject to constant harassing from both Jew and Gentile it would have been easy for them to become embittered. But it was just in this situation that they were called upon to render to no man evil for evil. The great precepts of the Christian faith are not addressed only to those who find them easy to keep, but to all” (p. 170). See Romans 12:17; 1 Peter 3:9. Fields notes the four ways to react: (a) The cruel or Communist way, return evil for good. (b) The common way, return evil for evil. (c) The courteous or civil way, return good for good. (d) The Christian way, return good for evil.. (p. 144)

“Always follow after”: “Keep up the chase after the good” (Robertson p. 37). This needs to be the common and habitual reaction for the Christian, and not the exception. “That which is good”: “Strive to do good always” (Con). “You must aim always at what is best” (Knox).

“That which is good” does not include supporting someone in their sin(s). We must always let God define the "good".

We need to remember that this specific verse is talking about returning "good" in the face of hostility. '..requires that we do to others what we would wish them to do to us, regardless of whether or not they actually do their part (Matthew 7:12; Luke 6:31).' (Marshall p. 153)

“One toward another, and toward all”: Christians and non-Christians. Therefore, Christians do have the right to become involved in wronging people in business and so on. God does care concerning how we treat the non-Christian.