Mark 4:
10 When he was alone, those who were around him along with the twelve asked him about the parables. 11 And he said to them, 'To you has been given the mystery of the kingdom of God, but for those outside, everything comes in parables; 12 in order that
"they may indeed look, but not perceive,
and may indeed listen, but not understand;
so that they may not turn again and be forgiven."'

13 And he said to them, 'Do you not understand this parable? Then how will you understand all the parables? 14 The sower sows the word.

Colossians 1:
25 I became its servant according to God's commission that was given to me for you, to make the word of God fully known, 26 the mystery that has been hidden throughout the ages and generations but has now been revealed to his saints. 27 To them God chose to make known how great among the Gentiles are the riches of the glory of this mystery, which is Christ in you, the hope of glory.

Romans 11:
1 I ask, then, has God rejected his people? By no means! I myself am an Israelite, a descendant of Abraham, a member of the tribe of Benjamin. 2 God has not rejected his people whom he foreknew. Do you not know what the scripture says of Elijah, how he pleads with God against Israel? 3 'Lord, they have killed your prophets, they have demolished your altars; I alone am left, and they are seeking my life.' 4 But what is the divine reply to him? 'I have kept for myself seven thousand who have not bowed the knee to Baal.' 5 So too at the present time there is a remnant, chosen by grace. 6 But if it is by grace, it is no longer on the basis of works, otherwise grace would no longer be grace.

7 What then? Israel failed to obtain what it was seeking. The elect obtained it, but the rest were hardened, 8 as it is written,
'God gave them a sluggish spirit,
eyes that would not see
and ears that would not hear,
down to this very day.'
9 And David says,
'Let their table become a snare and a trap,
a stumbling-block and a retribution for them;
10 let their eyes be darkened so that they cannot see,
and keep their backs for ever bent.'

Isaiah 6:
8 Then I heard the voice of the Lord saying, 'Whom shall I send, and who will go for us?' And I said, 'Here am I; send me!' 9 And he said, 'Go and say to this people:
"Keep listening, but do not comprehend;
keep looking, but do not understand."
10 Make the mind of this people dull,
and stop their ears,
and shut their eyes,
so that they may not look with their eyes,
and listen with their ears,
and comprehend with their minds,
and turn and be healed.'
11 Then I said, 'How long, O Lord?' And he said:
'Until cities lie waste
without inhabitant,
and houses without people,
and the land is utterly desolate;