The Lord desires His servants to preserve their holy and peculiar character. “Be ye not unequally yoked together with unbelievers,” is His command; “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.” FE 499.2
Never was there a time in earth's history when this warning was more appropriate than at the present time. Many professed Christians think, like Solomon, that they may unite with the ungodly, because their influence over those who are in the wrong will be beneficial; but too often they themselves, entrapped and overcome, yield their sacred faith, sacrifice principle, and separate themselves from God. One false step leads to another, till at last they place themselves where they cannot hope to break the chains that bind them. FE 500.1
Great care should be taken by Christian youth in the formation of friendships and in the choice of companions. Take heed, lest what you now think to be pure gold turns out to be base metal. Worldly associations tend to place obstructions in the way of your service to God, and many souls are ruined by unhappy unions, either business or matrimonial, with those who can never elevate or ennoble. 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. FE 500.2