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Proverbs 23:23 (NASB)truth, and do not sell it, Get wisdom and instruction and understanding. Buy

The truth is like the sun. The same sun that melts butter hardens concrete. I cannot draw a "breath of air", which I cannot see, without thanking God that I am alive. I know that air exists because I feel and see the results of its presence. The existence of the air I breathe is the result of many interrelated intricate processes which declare the existence of a great intelligence. The very existence of the earth, solar system, and universe screams out the existence of an intelligence of unlimited knowledge. This creation opens my mind and heart to the existence of God.

Romans 1:20 (NASB)
20 For since the creation of the world His invisible attributes, His eternal power and divine nature, have been clearly seen, being understood through what has been made, so that they are without excuse.

The same breath of air and universe looked at through a mind that desires freedom from the moral restraints set by an omniscient being, concludes it is the result of an accident of chance which defies all reason. Such a mind and heart is hardened by the truth of God's existence. Such a mind seeks to follow the limited knowledge of self and other men and has fallen in love with the pleasure of sin. Such a mind is at war with the truth and seeks to suppress it.

Romans 1:18 (NASB)
18 For the wrath of God is revealed from heaven against all ungodliness and unrighteousness of men who suppress the truth in unrighteousness,

Once the understanding is darkened by this self-imposed ignorance it becomes hardened like concrete and it is difficult for the truth to make it through the mental barriers.

Ephesians 4:17-19 (NASB)
17 So this I say, and affirm together with the Lord, that you walk no longer just as the Gentiles also walk, in the futility of their mind,
18 being darkened in their understanding, excluded from the life of God because of the ignorance that is in them, because of the hardness of their heart;
19 and they, having become callous, have given themselves over to sensuality for the practice of every kind of impurity with greediness.

And God sends to these haters and suppressors of truth all the delusional evidence needed to reinforce the lies they have chosen to believe.

2 Thessalonians 2:9-12 (NASB)
9 that is, the one whose coming is in accord with the activity of Satan, with all power and signs and false wonders,
10 and with all the deception of wickedness for those who perish, because they did not receive the love of the truth so as to be saved.
11 For this reason God will send upon them a deluding influence so that they will believe what is false,
12 in order that they all may be judged who did not believe the truth, but took pleasure in wickedness.

But it need not be this way. Unlike concrete, they can choose to allow the truth into their minds. They can choose to consider the evidence God has given.

John 17:17 (NASB)
17 "Sanctify them in the truth; Your word is truth.

Romans 1:16 (NASB)
16 For I am not ashamed of the gospel, for it is the power of God for salvation to everyone who believes, to the Jew first and also to the Greek.

Proverbs 21:28 (NASB)
28 A false witness will perish, But the man who listens to the truth will speak forever.

John 8:32 (NASB)
32 and you will know the truth, and the truth will make you free."

John 3:16 (NASB)
16 "For God so loved the world, that He gave His only begotten Son, that whoever believes in Him shall not perish, but have eternal life.