I know some guys who are very undisciplined in their habits. They can’t go to bed at a sensible hour, they sleep too late in the morning, they can’t manage their time and they can’t control their appetite or their lusts. As a result they rarely have time for daily Bible study and prayer. They are spiritual slackers!
But you can’t grow spiritually without practicing spiritual disciplines. Just as you cannot grow muscle without exercise and a proper diet, you need discipline to become a strong Christian. Part of your job as a mentor is to coach them to work hard and become disciplined so they will study the Bible regularly, develop a strong prayer life and learn to make wise use of their time. Don’t be afraid to set the bar high and motivate them to excel!