Now from this saying many imagine that the prophets were without the knowledge of Christ. But if they desired to see what the Apostles saw, they knew that He would come to men, and dispense those things which He did. For no one desires what he has no conception of; they therefore knew the Son of God. Hence He does not merely say, They desired to see me, but those things which ye see, nor to hear me, but those things which ye hear. For they saw Him, but not yet Incarnate, nor thus conversing with men, nor speaking with such authority to them.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).
Also cites: in Joan. Hom. 8.