Mark 4:33
With many other parables like these, Jesus kept speaking his message to them according to their ability to understand.
John 16:12
"I still have a lot to say to you, but you cannot bear it now.
Matthew 13:34-35
Jesus told the crowds all these things in parables. He did not tell them anything without using a parable.
1 Corinthians 3:1-2
Brothers, I couldn't talk to you as spiritual people but as worldly people, as mere infants in the Messiah.
Hebrews 5:11-14
We have much to say about this, but it is difficult to explain because you have become too lazy to understand.