The disciples are disturbed by this. The Greek is very strong – they were ‘greatly astonished’, ‘astonished beyond measure.
They had underestimated the holiness of God. When he looks on us deeply offensive. We have stolen from God, we do offensive things. There is no possibility of access to God in our own strength. As a schoolboy I went to visit a refuse furnace. We were round the corner and the door was opened and we saw white hot furnace. If we ever stepped into it, we would be destroyed. Anyone who tried would be crazy. Such is the holiness of God. Without the atonement of Christ it would be quite impossible to come into his presence, yet some think they can please God on their own merits – ‘I can just about make it.’ Like a vagrant who thinks he can get on board the Royal Flight by offering a few coins at the counter office. Human pride likes to think it can make it.