Chewing our own food.
About this we have much to say, and it is hard to explain, since you have become dull of hearing. For though by this time you ought to be teachers, you need someone to teach you again the basic principles of the oracles of God. You need milk, not solid food, for everyone who lives on milk is unskilled in the word of righteousness, since he is a child. But solid food is for the mature, for those who have their powers of discernment trained by constant practice to distinguish good from evil. [Hebrews 5:11-14 ESV]
Through Hebrews we find out that while we start out as spiritual infants, God calls us to grow and mature as we learn from His Word and apply it. We can't live on milk, and have others chew our spiritual food for us forever. God loves and nurtures us as infants, but doesn't want us to remain that way.