So that what was spoken through the prophet might be fulfilled: “I will open my mouth in parables. I will reveal things hidden from the foundation of the world” (Ps. 78:2).
This statement records that by speaking in parables Jesus is also fulfilling the prophecies of Holy Scripture. The quotation comes from Psalm 78:2 (a psalm of Asaph) and shows that in the messianic era the truths were to be revealed in a mysterious way. Thus, through his parables Jesus was carrying out what God had planned from the beginning, but had kept hidden until the fullness of the times.