'Difficult' in the Bible

He said, "What you ask is difficult. If you see me being taken from you, it will be so for you, but if not, it will not happen."

But his servants came near and spoke to him and said, "My father, [if] the prophet had spoken a difficult thing to you to do, would you not have done [it]? [Why not] even when he says to you, 'Wash and you shall be clean'?"