Mark 4:21-23
And he said to them, “Is a lamp brought in to be put under a basket, or under a bed, and not on a stand? For nothing is hidden except to be made manifest; nor is anything secret except to come to light. If anyone has ears to hear, let him hear.”
Why is a lamp lit? It is not for hiding its light. Just so, the purpose of a parable is not so as to permanently hide the truth. So listen with the ears of your understanding.
The secrets of Yeshu’s teaching are not hidden for certain ‘treasure-seekers’ only to find. He urged anyone to use his ears.