Note 4 at Lu 23:31: A green tree is healthy and full of life as opposed to a dry tree that is dead and withered. A green tree is very hard to burn, while a dry tree burns very easily.

Jesus was saying that if these things were happening to Him, then how much worse would it be for those who were unjustly condemning Him. If an innocent person were being treated this way, how would the corrupt and guilty be treated? A passage with similar meaning was spoken by the Apostle Peter in 1Pe 4:17.