"Finally, my brothers, rejoice in the Lord. To write the same things to you is no trouble to me and is safe for you."
What do we do when we want to emphasize something to someone to make sure he knows it and will remember it? We tell him multiple times.
If our teenager is going on a camping trip to the boundary waters in northern Minnesota then we are likely to tell him not to dive into water until the depth and freedom from rocks is first checked out. We tell him this multiple times and say as he leaves, "Now remember, don't dive into water until you have checked it out." We want to keep our teenager safe.
Paul tells the Philippian Christians that it is no trouble for him to remind them again of God's truth so they will be safe.
Why did he need to do this? False teachers were seeking to lead the Christians away from the truth. The truth protects us. False teaching robs us of abundant life.
If we forget the truth that sets us free to live an abundant life in any circumstance, then we become slaves of sin that ruins our life in any circumstance.
The scripture says we are to remind people in our sphere of influence of the truth that sets them free so they won't be enslaved by sin that ruins them. As we look at our life, is it in conformity with how Jesus tells us to live? Are we reminding people of God's truth to keep them safe from false teaching?
If we aren't, then we need to begin now so we can say with Paul, "To write the same things to you is no trouble to me and is safe for you."