HOV lanes are great! They have limited access, so there are not as many cars in that lane. With limited access, the traffic usually moves along at a more consistent pace. However, as the last two sentences have suggested, not everyone is permitted to drive in an HOV lane. Access is limited! Limited to drivers who have at least one other person with them in the car! If 
you’re by yourself, all alone in your travel, you are no t permitted in the HOV lane.
Suppose that access to heaven was like driving in an HOV lane. Suppose that you could not travel the highway into heaven’s gates unless you had someone with you-i.e., unless you had taught and helped to convert another person to the gospel, you were not permitted into heaven. Would that limit access to heaven? Would that keep some Christians out of the pearly gates?
That may sound awfully narrow, but read Matthew 7:13-14. That may sound awfully restrictive, but read Mark 16:15 and James 4:17 together. Does heaven have an “HOV lane” (only)?