Now we who are strong ought to bear the weaknesses of those without strength and not just please ourselves. Each of us is to please his neighbor for his good, to his edification. Romans 15:1-2
We walk according to the law of liberty as James calls it (James 1:23). The word of God has set reasonable guidelines for behavior in which we can live robust lives.
On the perimeter are gray areas that require circumspection. The question is how will my activity be viewed by others in and outside the faith, particularly weaker brothers or sisters?
There are times when what you might do is not prohibited but you do not want to risk even the appearance of evil. Other times, like Jesus dining with tax collectors, what is done is strategic to furthering the gospel, for edification (Matt. 9:10).
I always think of Paul purifying himself and underwriting the expenses of four Jews so that they might take their vows (Acts 21:23). His goal was unification using an act that did not conflict with his already clearly communicated gospel message. In this way he was all things to all people (1 Cor. 9:22).
On close inspection, Paul demonstrated to others that symbolism, ceremony and vows can still have a place in one’s religion, if they are not thought of as pathways to salvation.
The Spirit of God helps us sort all this out.