Theophylact of Ohrid
Catena Aurea · Lukasevangelium 9
—But while they wondered every one at all things which Jesus did, he said unto his disciples, Let these sayings sink down into your ears: for the Son of man shall be delivered into the hands of men. But they understood not this saying, and it was hid from them, that they perceived it not: and they feared to ask him of that saying.
Mark also the reverence of the disciples in what follows, And they feared to ask him of that saying. For fear is the first step to reverence.