Matthew 13:11

11And he answered them, aTo you it has been given to know bthe secrets of the kingdom of heaven, but to them it has not been given.

Hebrews 5:12-14

12For though by this time you ought to be teachers, you need someone to teach you again cthe basic principles of the oracles of God. You need dmilk, not solid food, 13for everyone who lives on milk is unskilled in the word of righteousness, since he is ea child. 14But solid food is for fthe mature, for those who have their powers gof discernment trained by constant practice to distinguish good from evil.

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