2 Peter 1:9

For whoever lacks these qualities is blind—shortsighted [closing his spiritual eyes to the truth], having become oblivious to the fact that he was cleansed from his old sins.

Ephesians 5:26

so that He might sanctify the church, having cleansed her by the washing of water with the word [of God],

Hebrews 9:14

how much more will the blood of Christ, who through the eternal [Holy] Spirit willingly offered Himself unblemished [that is, without moral or spiritual imperfection as a sacrifice] to God, cleanse your conscience from dead works and lifeless observances to serve the ever living God?

1 John 1:7

but if we [really] walk in the Light [that is, live each and every day in conformity with the precepts of God], as He Himself is in the Light, we have [true, unbroken] fellowship with one another [He with us, and we with Him], and the blood of Jesus His Son cleanses us from all sin [by erasing the stain of sin, keeping us cleansed from sin in all its forms and manifestations].

1 John 2:9-11

The one who says he is in the Light [in consistent fellowship with Christ] and yet habitually hates (works against) his brother [in Christ] is in the darkness until now.

Mark 10:21

Looking at him, Jesus felt a love (high regard, compassion) for him, and He said to him, “You lack one thing: go and sell all your property and give [the money] to the poor, and you will have [abundant] treasure in heaven; and come, follow Me [becoming My disciple, believing and trusting in Me and walking the same path of life that I walk].”

Luke 18:22

When Jesus heard this, He said to him, “You still lack one thing; sell everything that you have and distribute the money to the poor, and you will have [abundant] treasure in heaven; and come, follow Me [becoming My disciple, believing and trusting in Me and walking the same path of life that I walk].”

John 9:40-41

Some Pharisees who were with Him heard these things and said to Him, “Are we also blind?”

Romans 6:1-4

What shall we say [to all this]? Should we continue in sin and practice sin as a habit so that [God’s gift of] grace may increase and overflow?

Romans 6:11

Even so, consider yourselves to be dead to sin [and your relationship to it broken], but alive to God [in unbroken fellowship with Him] in Christ Jesus.

2 Corinthians 4:3-4

But even if our gospel is [in some sense] hidden [behind a veil], it is hidden [only] to those who are perishing;

Galatians 5:6

For [if we are] in Christ Jesus neither circumcision nor uncircumcision means anything, but only faith activated and expressed and working through love.

Galatians 5:13

For you, my brothers, were called to freedom; only do not let your freedom become an opportunity for the sinful nature (worldliness, selfishness), but through love serve and seek the best for one another.

Titus 2:14

who [willingly] gave Himself [to be crucified] on our behalf to redeem us and purchase our freedom from all wickedness, and to purify for Himself a chosen and very special people to be His own possession, who are enthusiastic for doing what is good.

James 2:14-26

What is the benefit, my fellow believers, if someone claims to have faith but has no [good] works [as evidence]? Can that [kind of] faith save him? [No, a mere claim of faith is not sufficient—genuine faith produces good works.]

1 Peter 3:21

Corresponding to that [rescue through the flood], baptism [which is an expression of a believer’s new life in Christ] now saves you, not by removing dirt from the body, but by an appeal to God for a good (clear) conscience, [demonstrating what you believe to be yours] through the resurrection of Jesus Christ,

2 Peter 1:4-7

For by these He has bestowed on us His precious and magnificent promises [of inexpressible value], so that by them you may escape from the immoral freedom that is in the world because of disreputable desire, and become sharers of the divine nature.

2 Peter 2:18-20

For uttering arrogant words of vanity [pompous words disguised to sound scholarly or profound, but meaning nothing and containing no spiritual truth], they beguile and lure using lustful desires, by sensuality, those who barely escape from the ones who live in error.

Revelation 3:17

Because you say, “I am rich, and have prospered and grown wealthy, and have need of nothing,” and you do not know that you are wretched and miserable and poor and blind and naked [without hope and in great need],

Treasury of Scripture Knowledge

Summary

But he that lacketh these things is blind, and cannot see afar off, and hath forgotten that he was purged from his old sins.

Bible References

Lacketh

2 Peter 1:5
For this very reason, applying your diligence [to the divine promises, make every effort] in [exercising] your faith to, develop moral excellence, and in moral excellence, knowledge (insight, understanding),
Mark 10:21
Looking at him, Jesus felt a love (high regard, compassion) for him, and He said to him, “You lack one thing: go and sell all your property and give [the money] to the poor, and you will have [abundant] treasure in heaven; and come, follow Me [becoming My disciple, believing and trusting in Me and walking the same path of life that I walk].”
Luke 18:22
When Jesus heard this, He said to him, “You still lack one thing; sell everything that you have and distribute the money to the poor, and you will have [abundant] treasure in heaven; and come, follow Me [becoming My disciple, believing and trusting in Me and walking the same path of life that I walk].”
Galatians 5:6
For [if we are] in Christ Jesus neither circumcision nor uncircumcision means anything, but only faith activated and expressed and working through love.
James 2:14
What is the benefit, my fellow believers, if someone claims to have faith but has no [good] works [as evidence]? Can that [kind of] faith save him? [No, a mere claim of faith is not sufficient—genuine faith produces good works.]

Blind

John 9:40
Some Pharisees who were with Him heard these things and said to Him, “Are we also blind?”
2 Corinthians 4:3
But even if our gospel is [in some sense] hidden [behind a veil], it is hidden [only] to those who are perishing;
1 John 2:9
The one who says he is in the Light [in consistent fellowship with Christ] and yet habitually hates (works against) his brother [in Christ] is in the darkness until now.
Revelation 3:17
Because you say, “I am rich, and have prospered and grown wealthy, and have need of nothing,” and you do not know that you are wretched and miserable and poor and blind and naked [without hope and in great need],

That he

2 Peter 1:4
For by these He has bestowed on us His precious and magnificent promises [of inexpressible value], so that by them you may escape from the immoral freedom that is in the world because of disreputable desire, and become sharers of the divine nature.
2 Peter 2:18
For uttering arrogant words of vanity [pompous words disguised to sound scholarly or profound, but meaning nothing and containing no spiritual truth], they beguile and lure using lustful desires, by sensuality, those who barely escape from the ones who live in error.
Romans 6:1
What shall we say [to all this]? Should we continue in sin and practice sin as a habit so that [God’s gift of] grace may increase and overflow?
Ephesians 5:26
so that He might sanctify the church, having cleansed her by the washing of water with the word [of God],
Hebrews 9:14
how much more will the blood of Christ, who through the eternal [Holy] Spirit willingly offered Himself unblemished [that is, without moral or spiritual imperfection as a sacrifice] to God, cleanse your conscience from dead works and lifeless observances to serve the ever living God?
1 Peter 3:21
Corresponding to that [rescue through the flood], baptism [which is an expression of a believer’s new life in Christ] now saves you, not by removing dirt from the body, but by an appeal to God for a good (clear) conscience, [demonstrating what you believe to be yours] through the resurrection of Jesus Christ,
1 John 1:7
but if we [really] walk in the Light [that is, live each and every day in conformity with the precepts of God], as He Himself is in the Light, we have [true, unbroken] fellowship with one another [He with us, and we with Him], and the blood of Jesus His Son cleanses us from all sin [by erasing the stain of sin, keeping us cleansed from sin in all its forms and manifestations].

General references

Deuteronomy 6:17
You shall diligently keep [foremost in your thoughts and actively do] the commandments of the Lord your God, and His testimonies and His statutes which He has commanded you.
Ecclesiastes 10:18
Through laziness the rafters [of state affairs] decay and the roof sags, and through idleness [the roof of] the house leaks.
Luke 11:35
Be careful, therefore, that the light that is in you is not darkness.