2nd Peter 1:

But he that lacks these things [of God] is blind, and cannot see afar off, and has forgotten that he was purged from his old sins.

Even though the soul and the mind's spirit of a person is purged from their old sins through their confession and initial water baptism into the new Life in Christ Jesus, there yet remains the corrupting influence of the nature of their flesh that needs cleansing through the Blood of the Spirit of  Jesus Christ.  If this is understood and the darkness of sin remains in ones being, then it must be that there is an accumulation of unrepented sins that has blinded the person who is wallowing up to their eyes in the mire of sin's corruption.  What must one do, so that the light of Christ Jesus is to shine in the heart of our minds?  Will we be able to  finally see the flood of judgment coming and repent? (Revelation 3 verse 16-19.) They washed their robes and made them white in the blood of the Lamb.

2nd Peter 2:

1 But there were false prophets also among the people, even as there shall be false teachers among you, who under false pretenses shall bring in damnable heresies, even denying the Lord that bought them, and bring upon themselves swift destruction.  Many will follow their unrestrained ways, and the Way of Truth will be blasphemed because of them.

2nd Peter 2:

19 While they promise them liberty, they themselves are the servants of corruption: For of whom a man is  overcome, of the same is he brought in bondage. 20 For if after they have escaped the pollutions of the world through the knowledge of the Lord and Savior Jesus Christ, they are again entangled therein, and overcome, the latter end is worse with them than the beginning. 21 For it had been better for them not to have known the way of righteousness, than, after they have known it, to turn from the holy commandment delivered unto them. 22 But it is happened unto them according to the true proverb, The dog is turned to his own vomit again; and the sow that was washed, to her wallowing in the mire.

2nd Peter 3:

9 The Lord is not slack concerning His promises, as some men cunt slackness: but is long suffering toward us, not willing that any should perish, but that all should come to repentance. (See 2nd Peter 3:5-12.)