Isaiah 45:23

I have sworn by myself— I have sworn by myself; the word of truth is gone out of my mouth, a word which shall not return,—That, &c. These are the words of the Son of God, declaring the purpose of grace, to illuminate all nations without distinction with the light of the Gospel, and to bring them to the true religion who worship the Father by the Son, the Mediator and Saviour, whom he hath appointed the Lord and Judge of the whole world. See Romans 14:11. Philippians 2:10 where St. Paul explains the phrase, Every tongue shall swear, by every tongue shall confess to God. To swear by the name of Christ is to confess his name, to profess his faith, and acknowledge his divinity.