1 Corinthians 13:11 (NKJV)
Almost every movie or show on television has some kind of a rating that tells you who the suggested viewing audience is. One of the things that is considered in this rating is the type of language that is used, which usually refers to profanity. There have been times that I saw a rating for some movie or show that cautioned people because "Adult Language" was involved. What they meant is that there was some profanity used and this movie or television show was not appropriate for children, hence the term "Adult Language".
While being a Christian is not based on following a set of rules, there are some things that are appropriate for us to say and do and some things that we should not say or do. One thing that is always right is walking in love. If we allow the love of God to help guide us in our life, we will have a much better life and we will be a greater help and blessing to others as well. 1 Corinthians 13 talks about the love of God, and Paul helps us to see that speaking in love is the kind of "adult language" that Christians should be using.
Paul said that when he was a child that he spoke, understood, and thought as a child. Children tend to be self-centered; everything revolves around what they want and what makes them happy. This is true of natural and spiritual children. Paul goes on to say that when he became an adult that he put away the childish things. For Christians, we need to grow and develop to spiritual adulthood and act and speak accordingly, in love. As a part of our walking in love with others, we need to be sure that the words we use are motivated by the love of God and not our own personal interests.