There is in the Christian world an astonishing, alarming indifference to the teaching of God's word in regard to the marriage of Christians with unbelievers. Many who profess to love and fear God choose to follow the bent of their own minds rather than take counsel of Infinite Wisdom. In a matter which vitally concerns the happiness and well-being of both parties for this world and the next, reason, judgment, and the fear of God are set aside; and blind impulse, stubborn determination are allowed to control. CCh 120.1
Men and women who are otherwise sensible and conscientious close their ears to counsel; they are deaf to the appeals and entreaties of friends and kindred and of the servants of God. The expression of a caution or warning is regarded as impertinent meddling, and the friend who is faithful enough to utter a remonstrance is treated as an enemy. All this is as Satan would have it. He weaves his spell about the soul, and it becomes bewitched, infatuated. Reason lets fall the reins of self-control upon the neck of lust; unsanctified passion bears sway, until, too late, the victim awakens to a life of misery and bondage. This is not a picture drawn by the imagination, but a recital of facts. God's sanction is not given to unions which He has expressly forbidden. CCh 120.2
The Lord commanded ancient Israel not to intermarry with the idolatrous nations around them: “Neither shalt thou make marriages with them; thy daughter thou shalt not give unto his son, nor his daughter shalt thou take unto thy son.” The reason is given. Infinite Wisdom, foreseeing the result of such unions, declares: “For they will turn away thy son from following Me, that they may serve other gods: so will the anger of the Lord be kindled against you, and destroy thee suddenly.” “For thou art an holy people unto the Lord thy God: the Lord thy God hath chosen thee to be a special people unto Himself, above all people that are upon the face of the earth.” In the New Testament are similar prohibitions concerning the marriage of Christians with the ungodly. The Apostle Paul, in his first letter to the Corinthians, declares: “The wife is bound by the law as long as her husband liveth; but if her husband be dead, she is at liberty to be married to whom she will; only in the Lord.” Again, in his second epistle, he writes: “Be ye not unequally yoked together with unbelievers: for what fellowship hath righteousness with unrighteousness? And what communion hath light with darkness? And what concord hath Christ with Belial? Or what part hath he that believeth with an infidel? And what agreement hath the temple of God with idols? For ye are the temple of the living God; as God hath said, I will dwell in them, and walk in them; and I will be their God, and they shall be My people. Wherefore come out from among them, and be ye separate, saith the Lord, and touch not the unclean thing; and I will receive you, and will be a Father unto you, and ye shall be My sons and daughters, saith the Lord Almighty.” CCh 120.3
Never should God's people venture upon forbidden ground. Marriage between believers and unbelievers is forbidden by God. But too often the unconverted heart follows its own desires, and marriages unsanctioned by God are formed. Because of this many men and women are without hope and without God in the world. Their noble aspirations are dead; by a chain of circumstances they are held in Satan's net. Those who are ruled by passion and impulse will have a bitter harvest to reap in this life, and their course may result in the loss of their souls. CCh 121.1
Those who profess the truth trample on the will of God in marrying unbelievers; they lose His favor and make bitter work for repentance. The unbelieving may possess an excellent moral character, but the fact that he or she has not answered to the claims of God and has neglected so great salvation is sufficient reason why such a union should not be consummated. The character of the unbelieving may be similar to that of the young man to whom Jesus addressed the words, “One thing thou lackest”; that was the one thing needful. CCh 121.2