'Hard' in the Bible

O Belteshazzar, master of the scribes, because I know that the spirit of the holy gods is in thee, and no secret is too hard for thee, tell me the visions of my dream which I have seen, and the interpretation of it.

forasmuch as an excellent spirit, and knowledge, and understanding, interpreting of dreams, and shewing of hard sentences, and solving of problems, were found in the same Daniel, whom the king named Belteshazzar. Now let Daniel be called, and he will shew the interpretation.