Acts 28:26-27

saying: Go to this people and say, You shall surely hear, but you will not understand; and you shall surely see, but you will not perceive.

John 8:43

Why do you not know what I say? Because you can not understand my words.

Ephesians 4:18

darkened in their understanding, alienated from the life of God through the ignorance that is in them, because of the hardness of their heart;

Matthew 13:11-15

He answered, and said to them: Because it is given to you to know the mysteries of the kingdom of heaven; but to them it is not given.

John 12:38-40

that the word of Isaiah the prophet might be fulfilled, which he spoke: Lord, who has believed our report? and to whom has the arm of the Lord been revealed?

Romans 11:7-10

What then? Israel has not obtained that which he seeks; but the chosen have obtained it, and the rest have been hardened to this day,

2 Corinthians 3:15

But to this day, when Moses is read, the vail is upon their heart:

2 Thessalonians 2:10-12

and with all the delusion of unrighteousness in those who perish, because they did not receive the love of the truth, in order that they might be saved.

2 Timothy 2:25

in meekness instructing those who oppose themselves, if, possibly, God may give them repentance in order to the acknowledgment of the truth,

James 1:13-17

Let no one say, when he is tempted, My temptation is from God; for God can not be tempted by evils, and he himself tempts no man.

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