Jamieson, Fausset and Brown on Mark 10:34

34. And they shall mock him, and shall scourge him, and shall spit upon him, and shall kill him: and the third day he shall rise again--Singularly explicit as this announcement was, Luke (Lu 18:34) says "they understood none of these things; and this saying was hid from them, neither knew they the things which were spoken." The meaning of the words they could be at no loss to understand, but their import in relation to His Messianic kingdom they could not penetrate; the whole prediction being right in the teeth of their preconceived notions. That they should have clung so tenaciously to the popular notion of an "unsuffering" Messiah, may surprise us; but it gives inexpressible weight to their after-testimony to a suffering and dying Saviour.

Ambitious Request of James and John--The Reply (Mr 10:35-45).