John 10:6
This parable spake Jesus to them; but they understood not what things they were which he spake to them.
Matthew 13:13-14
Therefore I speak to them in parables, because seeing they see not, and hearing they hear not, neither do they understand.
Matthew 13:51
Jesus saith to them, Have ye understood all these things? They say to him, Yea, Lord.
John 6:52
The Jews then debated among themselves, saying, How can this man give us his flesh to eat?
John 6:60
Many of his disciples hearing it, said, This is an hard saying: who can hear it?
John 7:36
What saying is this that he said, Ye shall seek me, and shall not find me? And where I am, ye cannot come?
John 8:27
They understood not, that he spake to them of the Father.
John 8:43
Why do ye not understand my discourse? Even because ye cannot hear my word.
John 16:25
I have spoken these things to you in parables: but the time is coming, when I will no longer speak to you in parables, but will shew you plainly of the Father.
1 Corinthians 2:14
But the natural man receiveth not the things of the Spirit; for they are foolishness to him: neither can he know them, because they are spiritually discerned.
1 John 5:20
But we know that the Son of God is come; and he hath given us an understanding that we may know the true one; and we are in the true one, even in his Son Jesus Christ; this is the true God and eternal life.