30 He that is not with me is against me; and he that gathereth not with me scattereth abroad.
31 Wherefore I say unto you, All manner of sin and blasphemy shall be forgiven unto men: but the blasphemy against the Holy Ghost shall not be forgiven unto men.
32 And whosoever speaketh a word against the Son of man, it shall be forgiven him: but whosoever speaketh against the Holy Ghost, it shall not be forgiven him, neither in this world, neither in the world to come.
33 Either make the tree good, and his fruit good; or else make the tree corrupt, and his fruit corrupt: for the tree is known by his fruit.
34 O generation of vipers, how can ye, being evil, speak good things? for out of the abundance of the heart the mouth speaketh.
35 A good man out of the good treasure of the heart bringeth forth good things: and an evil man out of the evil treasure bringeth forth evil things.
36 But I say unto you, That every idle word that men shall speak, they shall give account thereof in the day of judgment.
37 For by thy words thou shalt be justified, and by thy words thou shalt be condemned.
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Jesus' words about blasphemy against the Spirit seem mysterious. But they probably seem so to us because our perception of the Gospel text is often overlaid with theological models—in particular, Trinitarian models, especially when the text mentions the Holy Spirit. Yet in Gospel times no Trinitarian theology existed, of course, and God's Spirit was viewed more from a practical spiritual standpoint—as an element of concrete spiritual and mystical experience, and above all prophetic experience. In the context of prophetic experience, the Spirit is experienced as the entirely real breath of God entering the human heart and renewing a person from within. There could be no mistake here: either God breathed in the heart or He did not. Since that was the nature of the matter, there could be no question of confusion or misunderstanding.
When theological theories and concepts are involved, mistakes are possible, of course. One can even fail to recognize the Messiah in the Messiah. In principle that too can happen, and not necessarily through a person's ill will; the reasons may vary greatly. But when God's breath and its action obvious to everyone are involved, there can be no mistake. Only someone who does not want to see can fail to see this action.
If the refusal to see also becomes aggressive, so that a person begins to revile God and His works, such a position naturally becomes a spiritual dead end for him. This is not because God is easily offended, but because rejecting God's breath automatically means rejecting the Kingdom that this breath permeates from its center to its farthest reaches. And rejecting the Kingdom clearly leads to rejecting life and salvation—a rejection about which nothing can be done, because it is made freely, without any compulsion.