"In selecting a companion for life and for eternity," said President Spencer W. Kimball, "certainly the most careful planning and thinking and praying and fasting should be done to be sure that, of all the decisions, this one must not be wrong. In true marriage there must be a union of minds as well as of hearts. Emotions must not wholly determine decisions, but the mind and the heart, strengthened by fasting and prayer and serious consideration, will give one a maximum chance of marital happiness"