In reality marriage had proved to be the door out of a world of work and comradeship and laughter and innumerable things to do, into something like solitary confinement." (Lewis First 2 pages)
Yet, their encounter with an intergalactic, time-spanning conflict between primal forces of good and evil helped to restore their moral rectitude more expediently for Jane and significantly slower for Mark, who ultimately needs his wife love to complete his moral journey. Thus, the pair comes to realize that morally, "natural loves are God-given goods, yet are also prone to distortions…unless they are transformed by Charity" (Simon146)