Matthew 13:11-12
He replied, "Because it is granted you to understand the open secrets of the Realm of heaven, but it is not granted to these people.
John 6:45
In the prophets it is written, and they will be all instructed by God; everyone who has listened to the Father and learned from him, comes to me.
John 7:17
anyone who chooses to do his will, shall understand whether my teaching comes from God or whether I am talking on my own authority.
1 Corinthians 2:14-15
The unspiritual man rejects these truths of the Spirit of God; to him they are 'sheer folly,' he cannot understand them. And the reason is, that they must be read with the spiritual eye.
James 1:5
Whoever of you is defective in wisdom, let him ask God who gives to all men without question or reproach, and the gift will be his.