Treasury of Scripture Knowledge

Summary

For if we sin wilfully after that we have received the knowledge of the truth, there remaineth no more sacrifice for sins,

Bible References

If

Hebrews 6:4
[These are people] who were once enlightened [by the Gospel message], who had experienced the gift from heaven [i.e., forgiveness, never ending life, etc. See Rom. 6:23], who had partaken of the Holy Spirit [See Acts 2:38],
Matthew 12:31
Therefore I tell you, people will be forgiven of every sin and abusive word spoken [against God]. But abusive words spoken against the Holy Spirit will not be forgiven.
John 9:41
Jesus said to them, "If you were [really] blind [i.e., unable to see spiritually], you would not be guilty of sin. But since you claim, 'We can see [fine],' you remain guilty of sin."
1 Timothy 1:13
[even] though I had previously spoken against Christ, and persecuted [Christians] and acted outrageously. However, I obtained mercy because I acted out of ignorance, not believing [in Christ].
2 Peter 2:20
For if people who have escaped from the defiling practices of the world by coming to know our Lord and Savior Jesus Christ, become tangled up in them again, and are overcome by them, these people are worse off than before they were converted.
1 John 5:16
If anyone [of you] observes his brother [or sister] sinning [in a way that would not lead] to [spiritual] death, he should ask [God, in prayer, to help that person], and God will give him [spiritual] life, [that is], to such ones, provided their sin is not leading to [spiritual] death. There is such a sin that leads to [spiritual] death. [See Heb. 6:4-6; I Tim. 5:6; Heb. 10:26-27; II Pet. 2:20-22]. I am not suggesting that you should ask [God, in prayer] about such a situation.

General references

Matthew 7:27
And the [heavy] rains came down and the flood waters rose and the winds blew and struck against that house [until] it collapsed with a terrible crash."
Matthew 24:21
There will be great trouble [during these times], such as had never been from the beginning of time up to the present, or ever will be [in the days to come].
Mark 3:28
Truly I tell you, all of mankind's sins and the abusive language that they use in speaking against God [and men] can be forgiven.
Luke 12:10
And every person who speaks an [abusive] word against the Son of man will be forgiven of it, but the person who speaks abusive words against the Holy Spirit will not be forgiven of it.