35 So was fulfilled what was spoken through the prophet: “I will open my mouth in parables, I will utter things hidden since the creation of the world.”a

Read Matthew 13:35 Using Other Translations

That it might be fulfilled which was spoken by the prophet, saying, I will open my mouth in parables; I will utter things which have been kept secret from the foundation of the world.
This was to fulfill what was spoken by the prophet:"I will open my mouth in parables; I will utter what has been hidden since the foundation of the world."
This fulfilled what God had spoken through the prophet: “I will speak to you in parables. I will explain things hidden since the creation of the world. ”