John Chrysostom
Do you see that the disciples did not understand many things when He Himself did not reveal them to them?
So also when He said, "Destroy this temple, and in three days I will raise it up" (Jn 2:19), the disciples likewise did not understand.
Another Evangelist says that His word was hidden from them (Lk 18:34), and that they did not know that He had to rise from the dead.
This was rightly hidden from them. Therefore another Evangelist says that whenever they heard of this, they were sorrowful and grieved, because they did not understand the mystery of the Resurrection.
This, I say, was rightly hidden from them, since it surpassed their understanding.
But why was the sign of the donkey not revealed to them? Because this too was a great matter.
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Notice the Evangelist's wisdom. He is not ashamed to make their former ignorance visible.
They knew what was written, but they did not know that what was written referred to Christ.
They would have been scandalized that He, being King, had to suffer so much and undergo such betrayal.
On the other hand, they would not at once have understood the teaching about the Kingdom of which He spoke. According to another Evangelist, they thought that He was speaking of that kingdom.