As those seeking to live out the Great Commission (Matthew 28:18-20), Christians should always consider how their actions will affect their witness to a watching world.
Speaking of his own evangelistic ministry, Paul wrote:
Give no offense either to Jews or to Greeks or to the church of God; just as I also please all men in all things, not seeking my own profit but the profit of the many, that they may be saved. (1 Corinthians 10:32-33)
Paul was far more concerned with seeing sinners embrace Christ than he was with the exercise of his liberty. Thus he was willing to set aside his freedom for the sake of the gospel (1 Corinthians 9:19-23).
Whether or not you are aware of it, your behavior—both what you do as well as what you don’t do—affects your witness for Christ. It is an issue of testimony: What does your life say about God to the friends, relatives, coworkers, neighbors, or even strangers who might be watching you?
That’s the point Paul makes in Romans 14:16-18:
Therefore do not let what is for you a good thing be spoken of as evil; for the kingdom of God is not eating and drinking, but righteousness and peace and joy in the Holy Spirit. For he who in this way serves Christ is acceptable to God and approved by men.
The operative statement there is “approved by men.” Paul’s not talking about being a man-pleaser—he’s talking about the positive commendation of your lifestyle by the people who are watching.