Charles H. Spurgeon on Psalms 63:11

But the king shall rejoice in God. Usurpers shall fade, but he shall flourish; and his prosperity shall be publicly acknowledged as the gift of God. The Lord's anointed shall not fail to offer his joyful thanksgiving: his well established throne shall own the superior lordship of the King of kings; his rejoicing shall be alone in God. When his subjects sing, "Io triumphe, "he will bid them chant, "Te Deum." Every one that sweareth by him shall glory. His faithful followers shall have occasion for triumph; they shall never need to blush for the oath of their allegiance. Or, "swearing by him, "may signify adherence to God, and worship paid to him. The heathen swore by their gods, and the Israelite called Jehovah to witness to his asseveration; those, therefore, who owned the Lord as their God should have reason to glory when he proved himself the defender of the king's righteous cause, and the destroyer of traitors. But the mouth of them that speak lies shall be stopped. And the sooner the better. If shame will not do it, nor fear, nor reason, then let them be stopped with the sexton's shovelful of earth; for a liar is a human devil, he is the curse of men, and accursed of God, who has comprehensively said, "all liars shall have their part in the lake which burneth with fire and brimstone." See the difference between the mouth that praises God, and the mouth that forges lies: the first shall never be stopped, but shall sing on for ever; the second shall be made speechless at the bar of God. O Lord, we seek thee and thy truth; deliver us from all malice and slander, and reveal to us thine own self, for Jesus' sake. Amen.