“The sceptre of thy kingdom is a right sceptre.” He is the lawful monarch of all things that be. His rule is founded in right, its law is right, its result is right. Our King is no usurper and no oppressor. Even when he shall break his enemies with a rod of iron, he will do no man wrong ; his vengeance and his grace are both in conformity with justice. Hence we trust him without suspicion ; he cannot err ; no affliction is too severe, for he sends it ; no judgment too harsh, for he ordains it. O blessed hands of Jesus! The reigning power is safe with you. All the just rejoice in the government of the King who reigns in righteousness.
The Treasury of David Vol. 1 (Peabody, Maryland; The Hendrikson Publisher; 1988) p. 318 – Commentary on Psalm 45:6.