Ecclesiastes 8:4

"Since the word of the king is authoritative, who will say to him, 'What are you doing?'"

Of course this passage isn't teaching that the king can do anything he wants with God's approval. Rather, this statement is made in light of disobedient citizens and their appointed punishment. The king can back up what he says by force. "The wise man thus….. does not waste his influence on. lost cause" (Garrett p. 327). "Many passages in the Old Testament witness to the limits which loyalty to God must set on courtly tack and submissiveness; one has only to think of the outspoken prophets and, among the wise, of the indomitable Daniel and his companions. If such examples shame us out of conformism, the present verses keep the balance true by teaching due respect for government" (Kidner p. 75).