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.—”Fundamentals of Christian Education, 500. MYP 436.2