Several years ago, I read with great interest a book by Elmer G. Letterman entitled How Showmanship Sells. It is one of those success motivation books with a lot of good philosophy in it. He said, “People come to me oftentimes and ask me for the secret to success.” He continued, “There is no one simple answer to that, but there is one necessary first step to success—you must develop a one-track mind. You’ve got to decide what you want to do, and do it. You must not let yourself be sidetracked by other interests. If you find a person who is truly successful in their profession (or really in any realm of life), you almost invariably will find a person with a one-track mind.”
It’s that kind of dedication that leads to Christian maturity. If you’ve got too many interests in life, you will find yourself making little progress along the road to Christian maturity.