Introduction To Christianity - pg. 201

Indissoluble marriage is in fact only comprehensible and
feasible on the basis of faith in God's henceforward irrevocable
decision, embodied in Christ, in favour of "marriage" with
mankind. It stand or falls with this faith; in the long run it
is just as impossible outside this faith as it is necessary within it.
And once again it should be stated that it is precisely this
apparent fixation on the decision of one moment in life that
enables man to march forward, to consolidate himself stage by
stage, while the continual annulment of such decisions keeps
sending him back to the beginning again and condemns him to
a circular motion that encloses itself in the fiction of eternal youth
and thus refuses to accept the totality of human existence.