Hebrews 5:11-14 - Advanced Teaching Hindered By Immaturity

¹¹ Concerning whom we have much to say and difficult to be explained, since ye are become dull of hearing. ¹² For whereas ye ought for the time to be teachers of others, ye have need again of some one to teach you the first rudiments of the oracles of God; and are become such as have need of milk and not of solid food. ¹³ For every one that wanteth milk, is unacquainted with the doctrine of justification; for he is an infant: ¹⁴ but firm food is for persons come to age, who by habit have their senses exercised to a discernment both of good and evil.