Read Daniel 8:24 Using Other Translations
And his power shall be mighty, but not by his own power: and he shall destroy wonderfully, and shall prosper, and practise, and shall destroy the mighty and the holy people.
His power shall be great--but not by his own power; and he shall cause fearful destruction and shall succeed in what he does, and destroy mighty men and the people who are the saints.
He will become very strong, but not by his own power. He will cause a shocking amount of destruction and succeed in everything he does. He will destroy powerful leaders and devastate the holy people.