"...the light has come into the world, and men loved darkness rather than light, because their deeds were evil. For everyone practicing evil hates the light and does not come to the light, lest his deeds should be exposed." John 3:19-20

 "... if our gospel is veiled, it is veiled to those who are perishing, whose minds the god of this age has blinded, who do not believe, lest the light of the gospel of the glory of Christ, who is the image of God, should shine on them.
     "For we do not preach ourselves, but Christ Jesus the Lord, and ourselves your bondservants for Jesus’ sake. For it is the God who commanded light to shine out of darkness, who has shone in our hearts to give the light of the knowledge of the glory of God...." 2 Corinthians 4:3-6

"Hear this now, O foolish people, without understanding,
Who have eyes and see not, and who have ears and hear not:
Do you not fear Me?’ says the Lord.
‘Will you not tremble at My presence?" Jeremiah 5:21-22

"But they refused to heed, shrugged their shoulders, and stopped their ears so that they could not hear. Yes, they made their hearts like flint, refusing to hear..." Zachariah 6:11-12

They do not understand

"...the light shines in the darkness, and the darkness did not comprehend it." John 1:5

"...always learning and never able to come to the knowledge of the truth." 2 Timothy 3:7

"Jesus spoke to the multitude in parables; and without a parable He did not speak to them, that it might be fulfilled which was spoken by the prophet, saying: 'I will open My mouth in parables; I will utter things kept secret from the foundation of the world.'” Matthew 13:34-35

"And the disciples came and said to Him, 'Why do You speak to them in parables?' He answered and said to them, 'Because it has been given to you to know the mysteries of the kingdom of heaven, but to them it has not been given. ...

       Therefore I speak to them in parables, because seeing they do not see, and hearing they do not hear, nor do they understand.  And in them the prophecy of Isaiah is fulfilled, which says:  ‘Hearing you will hear and shall not understand, and seeing you will see and not perceive; for the hearts of this people have grown dull. Their ears are hard of hearing, and their eyes they have closed..." Matthew 13:10-15

"Paul... has written to you, as also in all his epistles...  in which are some things hard to understand, which untaught and unstable people twist to their own destruction, as they do also the rest of the Scriptures.
    "You therefore, beloved, since you know this beforehand, beware lest you also fall from your own steadfastness, being led away with the error of the wicked; but grow in the grace and knowledge of our Lord and Savior Jesus Christ." 2 Peter 3:15-18

"But He turned and said to Peter, 'Get behind Me, Satan! You are an offense to Me, for you are not mindful of the things of God, but the things of men.'” Matthew 16:23

"These people draw near to Me with their mouth, and honor Me with their lips, but their heart is far from Me. And in vain they worship Me, teaching as doctrines the commandments of men.’” Matthew 15:8-9

"I now send you, to open their eyes, in order to turn them from darkness to light, and from the power of Satan to God, that they may receive forgiveness of sins and an inheritance among those who are sanctified by faith in Me.’" Acts 26:17-18

“You shall speak My words to them, whether they hear or whether they refuse..." Ezekiel 2:7

"For this reason we... do not cease to pray for you, and to ask that you may be filled with the knowledge of His will in all wisdom and spiritual understanding; that you may walk worthy of the Lord, fully pleasing Him, being fruitful in every good work and increasing in the  knowledge of God;  strengthened with all might, according to His glorious power,  for all patience and longsuffering  with joy;  giving thanks to the Father who has qualified us to be partakers of  the inheritance of the saints in the light.  He has delivered us from  the power of darkness  and  conveyed us into the kingdom of the Son of His love,  in whom we have redemption  through His blood, the forgiveness of sins." Colossians 1:9-14

Only by His Spirit can we see

"He opened their understanding, that they might comprehend the Scriptures.” Luke 24:45

"Now we have received, not the spirit of the world, but the Spirit who is from God, that we might know the things that have been freely given to us by God.” 1 Corinthians 2:12

"And we know that the Son of God has come and has given us an understanding, that we may know Him who is true; and we are in Him who is true, in His Son Jesus Christ. This is the true God and eternal life." 1 John 5:20

"...we speak wisdom among those who are mature, yet not the wisdom of this age, nor of the rulers of this age, who are coming to nothing.  But we speak the wisdom of God in a mystery, the hidden wisdom which God ordained before the ages for our glory, which none of the rulers of this age knew; for had they known, they would not have crucified the Lord of glory.
     "But as it is written: 'Eye has not seen, nor ear heard, nor have entered into the heart of man the things which God has prepared for those who love Him.'
     "But God has revealed them to us through His Spirit." 1 Corinthians 2:6-10

"All Scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness, that the man of God may be complete, thoroughly equipped for every good work." 2 Timothy 3:16-17

Strength to follow the Truth

"Thy word have I hid in mine heart that I might not sin against thee." Psalm 119:11

"Now to Him who is able to establish you according to my gospel and the preaching of Jesus Christ, according to the revelation of the mystery kept secret since the world began but now made manifest, and by the prophetic Scriptures made known to all nations, according to the commandment of the everlasting God, for obedience to the faith— to God, alone wise, be glory through Jesus Christ forever." Romans 16:25-27

"Therefore do not be unwise, but understand what the will of the Lord is. And do not be drunk with wine, in which is dissipation; but be filled with the Spirit, speaking to one another in psalms and hymns and spiritual songs, singing and making melody in your heart to the Lord, giving thanks always for all things to God the Father in the name of our Lord Jesus Christ, submitting to one another in the fear of God." Ephesians 5:17

"And so we have the prophetic word confirmed, which you do well to heed as a light that shines in a dark place, until the day dawns and the morning star rises in your chearts; knowing this first, that no prophecy of Scripture is of any private interpretation, for prophecy never came by the will of man, but holy men of God spoke as they were moved by the Holy Spirit." 2 Peter 1:19

"I am Your servant; give me understanding,
That I may know Your testimonies." Psalm 119:125

You asked, 'Who is this who hides counsel without knowledge?’
Therefore I have uttered what I did not understand,
Things too wonderful for me, which I did not know." Job 42:3

"Study to show thyself approved unto God, a workman that needs not to be ashamed, rightly dividing the word of truth.  But shun profane and vain babblings: for they will increase unto more ungodliness." 2 Timothy 2:15