Watchtower-- Simplified Study Edition, September 2015, "Is Your Conscience a Reliable Guide?":
In ancient Rome, some Christians had different opinions about certain foods and celebrations. What advice did Paul give them? He said: “One man judges one day as above another; another judges one day the same as all others; let each one be fully convinced in his own mind.” Let us be careful to avoid stumbling others.—Read Romans 14:5, 13, 15, 19, 20.
At times, we may not understand why someone in the congregation makes a certain decision on a personal matter. What should we do? We should not be quick to judge him or force him to change his mind. Perhaps he needs to train his conscience more, or maybe it is too sensitive. (1 Corinthians 8:11, 12) Or perhaps our own conscience is not fully trained. When it comes to health care and other matters, each of us needs to make a personal decision and accept responsibility for it.