Matthew 13:10-13

His disciples came and asked him, “Why do you use parables when you talk to the people?” He replied, “You are permitted to understand the secrets of the Kingdom of Heaven, but others are not. To those who listen to my teaching, more understanding will be given, and they will have an abundance of knowledge. But for those who are not listening, even what little understanding they have will be taken away from them. That is why I use these parables