Matthew 12:30 ESV
30 Whoever is not with me is against me, and whoever does not gather with me scatters.
Matthew 12:31-32 ESV
31 Therefore I tell you, every sin and blasphemy will be forgiven people, but the blasphemy against the Spirit will not be forgiven. 32 And whoever speaks a word against the Son of Man will be forgiven, but whoever speaks against the Holy Spirit will not be forgiven, either in this age or in the age to come.
1 Timothy 1:13-14 ESV
13 though formerly I was a blasphemer, persecutor, and insolent opponent. But I received mercy because I had acted ignorantly in unbelief, 14 and the grace of our Lord overflowed for me with the faith and love that are in Christ Jesus.
"...was never intended to torment anxious souls honestly desiring to know Christ, but the verses stand out as a blazing beacon warning of the danger of persisting in the rejection of the Spirit’s testimony of Christ until the seared conscience no longer responds to the gospel message."
Ironside, H. A., H. A. Ironside Commentary – Mark, (San Diego, CA: Horizon Press, 1948)
1 John 5:13 ESV
13 I write these things to you who believe in the name of the Son of God, that you may know that you have eternal life.
John 3:16 ESV
16 “For God so loved the world, that he gave his only Son, that whoever believes in him should not perish but have eternal life.
Hebrews 10:14 ESV
14 For by a single offering he has perfected for all time those who are being sanctified.
John 10:28-30 ESV
28 I give them eternal life, and they will never perish, and no one will snatch them out of my hand. 29 My Father, who has given them to me, is greater than all, and no one is able to snatch them out of the Father's hand. 30 I and the Father are one.”
John 15:26 ESV
26 “But when the Helper comes, whom I will send to you from the Father, the Spirit of truth, who proceeds from the Father, he will bear witness about me.
John 16:8 ESV
8 And when he comes, he will convict the world concerning sin and righteousness and judgment:
Isaiah 5:20 ESV
Woe to those who call evil good
and good evil,
who put darkness for light
and light for darkness,
who put bitter for sweet
and sweet for bitter!
Romans 1:29-32 ESV
29 They were filled with all manner of unrighteousness, evil, covetousness, malice. They are full of envy, murder, strife, deceit, maliciousness. They are gossips,30 slanderers, haters of God, insolent, haughty, boastful, inventors of evil, disobedient to parents, 31 foolish, faithless, heartless, ruthless.32 Though they know God's righteous decree that those who practice such things deserve to die, they not only do them but give approval to those who practice them.
Hebrews 3:16-19 ESV
16 For who were those who heard and yet rebelled? Was it not all those who left Egypt led by Moses? 17 And with whom was he provoked for forty years? Was it not with those who sinned, whose bodies fell in the wilderness? 18 And to whom did he swear that they would not enter his rest, but to those who were disobedient? 19 So we see that they were unable to enter because of unbelief.
Matthew 12:33 ESV
33 “Either make the tree good and its fruit good, or make the tree bad and its fruit bad, for the tree is known by its fruit.
Matthew 12:34-37 ESV
34 You brood of vipers! How can you speak good, when you are evil? For out of the abundance of the heart the mouth speaks. 35 The good person out of his good treasure brings forth good, and the evil person out of his evil treasure brings forth evil. 36 I tell you, on the day of judgment people will give account for every careless word they speak, 37 for by your words you will be justified, and by your words you will be condemned.”