fortunately not for eternity 
Hell is a temporary residence for souls who are on the way to the spheres of light. 

Illustration: Divina Commedia, see Dante and Doré. 
On earth people talk of hell, in the books by Jozef Rulof the dark spheres are described as the temporary residence for souls with a dark and distructive life of feeling. 
These souls are on the way to the first sphere of light, which they can reach by letting go of their dark feelings.