1 Corinthians 3:2
I gave you milk to drink, not solid food, for you were not yet able [to eat it]. But now you are still not able,
John 16:12
I still have many [things] to say to you, but you are not able to bear [them] now.
1 Peter 2:2
like newborn infants long for the unadulterated spiritual milk, so that by it you may grow up to salvation,
Hebrews 5:11-14
Concerning this {we have much to say and it is difficult to explain}, since you have become sluggish in hearing.
Treasury of Scripture Knowledge
Summary
I have fed you with milk, and not with meat: for hitherto ye were not able to bear it, neither yet now are ye able.
General references
Bible References
Fed
Hebrews 5:12
For indeed, [although you] ought to be teachers {by this time}, you have need of someone to teach you again the beginning elements of the oracles of God, and {you have need of} milk, not solid food.
1 Peter 2:2
like newborn infants long for the unadulterated spiritual milk, so that by it you may grow up to salvation,
General references
Mark 7:18
And he said to them, "So are you also without understanding? Do you not understand that everything [that is] outside that goes into a person [is] not able to defile him?