I may be wrong, but I doubt that teaching Sunday school is the only thing that occupies your time. If you are like most of the lay workers in the church I know, you have got quite a bit going on besides preparing for this lesson. In the busyness of life, we can often get the job done on our own strength, and then we wonder why our ministry is not very fruitful. Take time to ask the Holy Spirit to guide you as it says in John 16:13, “When he, the Spirit of truth, is come, he will guide you into all truth.” Ask Him to lead you into all truth as you lead your class members. Ask Him to be your Guide, and depend on Him to do the work you cannot do. “Holy Spirit, be my Guide. Holy Spirit, my door’s open wide. Make me to know Thy will divine; Holy Spirit, be Thou mine” (Mildred Cope).