Matthew 12:28-38

28 But if it is by the power of the Spirit of God that I expel the demons, it is evident that the Kingdom of God has come upon you.
29 Again, how can any one enter the house of a strong man and carry off his goods, unless first of all he masters and secures the strong man: then he will ransack his house.
30 "The man who is not with me is against me, and he who is not gathering with me is scattering abroad.
31 This is why I tell you that men may find forgiveness for every other sin and impious word, but that for impious speaking against the Holy Spirit they shall find no forgiveness.
32 And whoever shall speak against the Son of Man may obtain forgiveness; but whoever speaks against the Holy Spirit, neither in this nor in the coming age shall he obtain forgiveness."
33 "Either grant the tree to be wholesome and its fruit wholesome, or the tree poisonous and its fruit poisonous; for the tree is known by its fruit.
34 O vipers' brood, how can you speak what is good when you are evil? For it is from the overflow of the heart that the mouth speaks.
35 A good man from his good store produces good things, and a bad man from his bad store produces bad things.
36 But I tell you that for every careless word that men shall speak they will be held accountable on the day of Judgement.
37 For each of you by his words shall be justified, or by his words shall be condemned."
38 Then He was accosted by some of the Scribes and of the Pharisees who said, "Teacher, we wish to see a sign given by you."
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