Bede the Venerable

Or else; Whoso saith that the works of the Holy Spirit are those of Beelzebub, it shall not be forgiven him either in the present world, or in that which is to come. Not that we deny that if he could come to repentance he could be forgiven by God, but that we believe that such a blasphemer as by the necessity of his deserts he would never come to forgiveness, so neither to the fruits themselves of a worthy repentance; according to that, He hath blinded their eyes, so that they should not be converted, and I should heal them. (Isa. 6:10.)