In these verses Jesus once again tells his disciples what is going to happen to him but not surprisingly they don't seem to get it. Does the fact that Jesus has already told them about his death suggest that he wants to show that if he is trying to tell us something and we don't understand, then as long as we keep listening for his voice he will persevere? To quote an old saying "there's none so deaf as those that don't want to hear!"
I also wonder why Jesus didn't make them understand. Perhaps he knew how upset they would be if they understood his meaning and so decided to let them live in ignorance a little longer and possibly prevent them trying to stop him from making the journey to Jerusalem.
Verse 33 is so short that you could almost miss it and yet it contains one of the most important phrases in the bible - that Jesus would rise again. It is a welcome final part to a difficult read to which we can respond Hallelujah!