One should be sure that he/she is going to Heaven once accepting Jesus Christ as one's personal saviour, for those who believe otherwise, am sorry I don't know. Once you have this ticket, the task at hand is to make righteous a part of your daily tasks, so that every day you are more white than yesterday. Of course there is a provision of asking for forgiveness one sin comes in, but one needs to enjoy everday life in salvation, live longer, healthy, wealthy, lovingly, as well as ready for the Kingdom, but not predicting if it's coming tonight, or the next evening. There, you will have time and resources in your haert to spread the Gospel.