This helped him when he was asked a question and had to answer it. Writing is also for your own enjoyment. One way it is enjoyable is that writing exercises your creativity. You can be anything anywhere and control the circumstances. You also learn to stretch your creativity to come up with the perfect introduction and conclusion.
Writing is in fact refreshing.
It is a great feeling when you have a finished project that you can be proud of and people can literally read and enjoy. You also need to write well for other people's benefit. You can make their day better by a humorous essay or a piece describing Christ's grace. You can also write pieces aiming for the secular crowd, on topics such as Christ's grace, his church, and His peace, presenting them in a way that makes them desirable. If published, others could read them and be drawn into the church.