'Fulfillment' in the Bible

This was to fulfill what was spoken by the prophet Isaiah:

In them the prophecy of Isaiah is being fulfilled, which says,‘You will hear and keep on hearing, but never understand;And you will look and keep on looking, but never comprehend;

This was to fulfill what was spoken by the prophet:“I will open My mouth in parables;I will utter things [unknown and unattainable] that have been hidden [from mankind] since the foundation of the world.”