The exciting thing about true conversion is that there will be little need for what is commonly called “follow-up.” A true convert will not need to be followed. He will put his hand to the plow and not look back (Luke 9:62). Of course, he will have to be fed, discipled, and nurtured. These things are biblical and most necessary. This can be done simply by encouraging him to read the Bible daily, answering questions he may have, and teaching him principles of fellowship, prayer, evangelism, etc. (see our booklet, Save Yourself Some Pain).
Sometimes there is confusion between “follow-up” (we need to follow the new convert because he will fall away if we don’t) and discipleship (instructing him to continue in the word of Christ—John 8:31). Look what happened after the Ethiopian eunuch was saved—he was left without follow-up. The Spirit of God transported Philip away and left the new convert in the wilderness. This is because his salvation wasn’t dependent on Philip, but upon his relationship with the indwelling Lord. Those whom God saves, He keeps. If He is the author of their faith, He will be the finisher. If He has begun a good work in them, He will complete it. He is able to keep them from falling and present them faultless before the presence of His glory with exceeding joy.