designs
That's because you don't study, you need to think through your ideas and see how ridiculous they are with the moral and ethical castigations they place on the Supreme Being..
No, the reason you can't offer any proof Jesus ever taught such a thing as "kingdom within" is because there is none.
No nightmares here, but as a counselor I hear many stories of Fundamentalist and Pentecostal children with nightmares. Superstitions are like that, hopefully others will see it and avoid the trap..
Here is some proof of what He taught about hell.
Mat 25:31
"When the Son of Man comes in his glory, and all the angels with him, then he will sit on his glorious throne. 32Before him will be gathered all the nations, and he will separate people one from another as a shepherd separates the sheep from the goats. 33And he will place the sheep on his right, but the goats on the left. 34Then the King will say to those on his right, 'Come, you who are blessed by my Father, inherit the kingdom prepared for you from the foundation of the world. 35For I was hungry and you gave me food, I was thirsty and you gave me drink, I was a stranger and you welcomed me, 36I was naked and you clothed me, I was sick and you visited me, I was in prison and you came to me.' 37Then the righteous will answer him, saying, 'Lord, when did we see you hungry and feed you, or thirsty and give you drink? 38And when did we see you a stranger and welcome you, or naked and clothe you? 39And when did we see you sick or in prison and visit you?' 40And the King will answer them, 'Truly, I say to you, as you did it to one of the least of these my brothers, you did it to me.' 41"Then he will say to those on his left, 'Depart from me, you cursed, into the eternal fire prepared for the devil and his angels.