A.T. Robertson Commentary Matthew 13:35

"that it might be fulfilled which was spoken through the prophet, saying, I will open my mouth in parables; I will utter things hidden from the foundation of the world." — Matthew 13:35 (ASV)

I will utter (ερευξομα). To cast forth like a river, to gurgle, to disgorge, the passion of a prophet. From Ps 19:2; 78:2. The Psalmist claims to be able to utter "things hidden from the foundation of the world" and Matthew applies this language to the words of Jesus. Certain it is that the life and teaching of Jesus throw a flood of light on the purposes of God long kept hidden (κεκρυμμενα).