Matthew 13:11-12

And he answered them, "To you it has been given to know the secrets of the kingdom of heaven, but to them it has not been given.

John 6:45

It is written in the prophets, 'And they shall all be taught by God.' Everyone who has heard and learned from the Father comes to me.

John 7:17

If anyone is willing to do his will, he shall know whether the teaching is from God or whether I speak on my own authority.

1 Corinthians 2:14-15

But the natural man does not accept the things of the Spirit of God, for they are foolishness to him; and he cannot understand them, because they are spiritually discerned.

James 1:5

If any of you lacks wisdom, let him ask of God, who gives to all generously and without reproach, and it will be given to him.

Treasury of Scripture Knowledge

Summary

They are all plain to him that understandeth, and right to them that find knowledge.

Bible References

General references

Matthew 13:11
And he answered them, "To you it has been given to know the secrets of the kingdom of heaven, but to them it has not been given.
John 6:45
It is written in the prophets, 'And they shall all be taught by God.' Everyone who has heard and learned from the Father comes to me.
John 7:17
If anyone is willing to do his will, he shall know whether the teaching is from God or whether I speak on my own authority.
1 Corinthians 2:14
But the natural man does not accept the things of the Spirit of God, for they are foolishness to him; and he cannot understand them, because they are spiritually discerned.
James 1:5
If any of you lacks wisdom, let him ask of God, who gives to all generously and without reproach, and it will be given to him.