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.
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Theophylact of Ochrid
AD 1107
He brings forward as witness the prophet who had proclaimed beforehand that Jesus would teach in parables (Ps. 77:2), lest you think that Christ had invented some new form of teaching. But do not understand the prophecy in terms of cause and effect, but rather from the outcome of the event. For Christ did not teach in this manner in order to fulfill the prophecy, but rather, because He taught in parables, the word of the prophet is found in the outcome to have been fulfilled in Him. "Without a parable spake He not unto them" on this occasion only, for indeed He did not always speak to them in parables. The Lord uttered those things which were hidden since the foundation of the world. For He Himself revealed to us the mysteries of the heavens.