What this means is those that believe and already have a lot of faith, they get to see the miracles first, more than confirming their faith. But for those who have no faith at all or don't believe, God throws stumbling blocks in their way. He puts them into darkness and leads them to a steep cliff then Jesus comes from behind and pushes him over the edge. So it's kinda one-sided.
Did you ever go out witnessing with this crap (J c)......it explains those that have come in and those that havnen't. 100% either way cant lose.