Jesus said: “Marriage is honorable and is to be desired by all men. The fact that the Son of Man pursues his earth mission alone is in no way a reflection on the desirability of marriage. That I should so work is the Father’s will, but this same Father has directed the creation of male and female, and it is the divine will that men and women should find their highest service and consequent joy in the establishment of homes for the reception and training of children, in the creation of whom these parents become copartners with the Makers of heaven and earth. And for this cause shall a man leave his father and mother and shall cleave to his wife, and they two shall become as one.”
The Urantia Book 167:5.7
But while marriages may be approved or disapproved on high, they are hardly made in Heaven. The human family is a distinctly human institution, an evolutionary development. Marriage is an institution of society, not a department of the church. True, religion should mightily influence it but should not undertake exclusively to control and regulate it.
The Urantia Book 83:1.4
Symbolic communication between human beings predetermines the bringing into existence of social groups. The most effective of all social groups is the family, more particularly the two parents. Personal affection is the spiritual bond which holds together these material associations. Such an effective relationship is also possible between two persons of the same sex, as is so abundantly illustrated in the devotions of genuine friendships.
The Urantia Book 160:2.4
I repeat, such inspiring and ennobling association finds its ideal possibilities in the human marriage relation. True, much is attained out of marriage, and many, many marriages utterly fail to produce these moral and spiritual fruits. Too many times marriage is entered by those who seek other values which are lower than these superior accompaniments of human maturity. Ideal marriage must be founded on something more stable than the fluctuations of sentiment and the fickleness of mere sex attraction; it must be based on genuine and mutual personal devotion. And thus, if you can build up such trustworthy and effective small units of human association, when these are assembled in the aggregate, the world will behold a great and glorified social structure, the civilization of mortal maturity. Such a race might begin to realize something of your Master’s ideal of “peace on earth and good will among men.” While such a society would not be perfect or entirely free from evil, it would at least approach the stabilization of maturity.
The Urantia Book 160:2.10